Rev. February 7, 2014
Rev. August 27, 2014
Stormwater Investigation at Mariners Cove
Westerville, OH May 8, 2013 Rev. February 7, 2014 Rev. August 27, 2014 1.0 OVERVIEW ......................................................................................... PAGE 1 2.0 INTRODUCTION AND OBJECTIVES ...................................................... PAGE 3 3.0 GENERAL INFORMATION REGARDING THE STUDY AREA .................... PAGE 4 3.1 Brief History of Study Area ..................................................................................... PAGE 4 3.2 Watershed Description ........................................................................................... PAGE 5 3.3 Public Interaction .................................................................................................... PAGE 6 4.0 REVIEW OF EXISTING INFORMATION ................................................. PAGE 7 4.1 Existing Storm System ............................................................................................. PAGE 7 4.2 Field Reconnaissance and Maintenance Activities ................................................ PAGE 9 4.3 Documented High Water Events ......................................................................... PAGE 16 5.0 WATER‐LEVEL MONITORING PROGRAM .......................................... PAGE 24 5.1 Overview of Monitoring Program ......................................................................... PAGE 24 5.2 Description of Water‐Level Monitoring Equipment ............................................ PAGE 24 6.0 ANALYSIS OF WATER‐LEVEL MONITORING DATA ............................ PAGE 29 6.1 Description and Analysis of Graphed Data ........................................................... PAGE 29 6.2 Conclusions from Data Analysis ........................................................................... PAGE 36 7.0 CONCLUSIONS ................................................................................. PAGE 37 7.1 Storm System Modification Alternatives .............................................................. PAGE 39 7.2 Comprehensive Watershed Study ....................................................................... PAGE 40 TABLES: TABLE 1: Monitoring Equipment Summary ...................................................................... PAGE 26 TABLE 2: Graphed Rainfall Events ................................................................................... PAGE 30 TABLE 3: Peak Water‐level Elevations ............................................................................. PAGE 31 TABLE 4: NOAA Atlas 14 Frequency Rainfall Depths ......................................................... PAGE 32 FIGURES: FIGURE 1: Overview of Study Area ................................................................................... PAGE 4 FIGURE 2: Modified Storm Inlets .................................................................................... PAGE 11 FIGURE 3: Field Verification of Protected Areas ....................................................... PAGES 12‐16 FIGURE 3A: Section 7 – 571/587 Lighthouse Court (Looking South) ................................ PAGE 12 FIGURE 3B: Section 7 – 587 Lighthouse Court (Looking Northwest) ............................... PAGE 13 FIGURE 3C: Section 1 – 1000 Inlet Court (Looking South) .............................................. PAGE 14 FIGURE 3D: Section 1 – 990 Inlet Court (Looking East) .................................................. PAGE 15 FIGURE 3E: Section 1 – 990 Inlet Court (Looking East) .................................................. PAGE 16 FIGURE 4: Photo Documentation of High Water Events (October 2011) .................... PAGES 19‐20 FIGURE 4A: Section 7 – 571 Lighthouse Court (Looking North) ....................................... PAGE 19 FIGURE 4B: Wetland West of 571 Lighthouse Court (Otterbein Property) ....................... PAGE 20 FIGURE 5: Photo Documentation of High Water Events (October 2012) .................... PAGES 21‐22 FIGURE 5A: Section 1 – 1016 Inlet Court (Looking North) .............................................. PAGE 21 FIGURE 5B: Section 1 – 1016 Inlet Court (Looking West) ............................................... PAGE 22 FIGURE 6: Photo Documentation of High Water Events (Summer 2011) .................... PAGES 23‐24 FIGURE 6A: Section 1 – Inlet Court and Bay Drive (Looking Northwest) .......................... PAGE 23 FIGURE 6B: Section 1 – Bay Drive (Looking West).......................................................... PAGE 24 FIGURE 7: Meter No. 1 at Spring Run, Looking East ......................................................... PAGE 26 FIGURE 8: Meter No. 2 at 1016 Inlet Ct., Looking North ................................................... PAGE 27 FIGURE 9: Meter No. 3 In Wetland Behind 1016 Inlet Ct., Looking North .......................... PAGE 27 FIGURE 10: Meter No. 4A at 587 Lighthouse Ct., Looking Northwest ................................ PAGE 28 FIGURE 11: Meter No. 4B at 571 Lighthouse Ct., Looking South ....................................... PAGE 28 FIGURE 12: Meter No. 5 at 571 Lighthouse Ct., Looking West .......................................... PAGE 29 FIGURE 13: Debris Line on West Side of 1016 Inlet Ct., Looking North toward Meter 2 after September 2, 2012 Rainfall Event ................................................................................. PAGE 32 FIGURE 14: Overland routing of flow from the 1000/1016 Inlet Court “No Build Zone” to the street during June 24‐25, 2014 rainfall event, after peak elevation. ........................................... PAGE 35 APPENDICES: APPENDIX A: Exhibits 1, 2, 3 and 4 APPENDIX B: Record Plat and Deed Restrictions APPENDIX C: Informational Brochure APPENDIX D: Water‐level Monitoring Graphs APPENDIX E: Storm Sewer Improvement Alternates: Exhibits 5, 6, 7 and 8 APPENDIX F: Westerville Annual Rainfall Graph
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 1.0 OVERVIEW In the fall of 2011, The City of Westerville contracted with EMH&T to perform a stormwater investigation related to residential concerns of high water within the Mariners Cove subdivision. The residents of the Mariners Cove subdivision had brought forth concerns about the frequency, duration, and extents of high water with respect to streets and yards. This investigation incorporated design information, field reconnaissance, and the collection and analysis of water‐level monitoring data from various locations in the immediate vicinity of the study area. Also included was the staking in the field of the platted limits of property lines, easements, wetland preserves and other no‐build zones individual lots within Sections 1 and 7 of the study area. During the study period, there were a few rainfall events that resulted in localized high water conditions within the study area. In general, with one exception, the frequency of high water occurrences was not to the extent of past events as shown in photos and videos provided by residents. Some of the reduction in these events may have been the result of sewer modifications during the study period and to rainfall being less than the previous year. Within Mariners Cove, there are covenants to protect areas designated as easements, no‐build zones and wetland preserves from encroachments and improvements that would interfere with the intended drainage and/or would interrupt the natural conditions associated with a designated wetland. These protected areas were specifically designated to convey and potentially hold stormwater (as stated in the deed restrictions). Some of the houses have been constructed in close proximity to, and in some cases, almost directly on, easements, no build lines, and/or water routing paths. Homeowner improvements on some lots are not permitted uses within these protected areas, including mowed lawns in the wetland preserve areas. It is these areas that seem to be the most prone to frequent and sustained periods of ponding water, as they were designed to be. This study also involved investigating potential improvements to the existing storm system. The improvements that have been recommended would provide additional inlet capacity for stormwater runoff and potentially reduce the depth of water within the study area during more frequent, lower intensity rainfall events. These improvements are not intended to address stormwater ponding within wetlands, easements and/or no build zones. In addition, larger rainfall events that exceed the design capacity of the underground storm sewer system would continue to follow overland routing throughout the subdivision, in accordance with the design of the subdivision. Indications are that the stormwater system within the study area is operating as to the original design and intent. High water elevations do not appear to have exceeded the original design. The frequency and duration of high water events experienced by the residents are most likely emht.com | 1 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 the result of stormwater runoff from the upstream watershed associated with the wetland areas adjacent to the site, which is supported by the water‐level monitoring program performed as a part of this study. A technical analysis of the regional watershed, including Spring Run, to more definitively determine stormwater runoff under various rainfall events would provide the City with the ability to also consider measures within the upstream watershed area to diminish those flows. It is likely not possible, nor is it practical, to pursue a watershed‐based solution that would entirely eliminate the high water events on these properties. Their location and proximity to wetlands, and the intended drainage features included in the design of the subdivision, indicate portions of this area will be prone to standing water and overland routing during certain storm events. emht.com | 2 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 2.0 INTRODUCTION AND OBJECTIVES As requested by, and in coordination with, the City of Westerville, EMH&T has performed a stormwater investigation related to residents' concerns of high water within the Mariners Cove subdivision. The residents of the subdivision have brought forth concerns about areas of high water with respect to streets and yards. The specific focus of this investigation was the area surrounding Section 1 (Inlet Court) and Section 7 (Lighthouse Court) of the subdivision. These portions of the development abut existing wetland preserves and are downstream of a large off‐site watershed area. Refer to Exhibit 1 in Appendix A for an overview map and Exhibit 3 in Appendix A for the offsite watershed tributary map of the Mariners Cove study area and surrounding development. Figure 1 provides a similar view and highlights the area of Sections 1 and 7 of the subdivision. The storm system associated with these areas collects runoff from this watershed and discharges to Spring Run. Residents in this area have questioned water levels in and around their properties on numerous occasions, including several since EMH&T became involved in this stormwater investigation. The purpose of this investigation was to evaluate the residents’ concerns regarding high water conditions based on a review of design information, field reconnaissance, and the collection and analysis of water‐level monitoring data from various locations in the immediate vicinity of the study area. The investigation has included public meetings conducted by the City to gain information from the area residents and, at the same time, provide information regarding the nature of the surrounding watershed and, particularly, the wetland areas and the design and function of the stormwater system and overland routing paths established as part of the development of the Mariners Cove subdivision. This investigation has not included an extensive study of the upstream and off‐site watershed. The focus has been on the drainage features immediately surrounding Inlet Court and Lighthouse Court and whether they are functioning as designed. This investigation also does not address issues with possible ground water and its impacts on building foundations, basement walls, sump pumps and sub‐surface drainage concerns at individual homes. The City has provided, and continues to provide, maintenance to the existing storm system to ensure it will perform as designed. With this investigation, we have collaborated with City staff to identify and address maintenance issues as well as to evaluate any potential relationship between high water in Spring Run and on the properties within Sections 1 and 7 of the Mariners Cove subdivision. From this information, we are seeking to provide the City additional findings and recommendations related to the functioning of the stormwater system. emht.com | 3 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURE 1: Overview of Study Area Maxtown Road
Spring Run Mariner’s Cove, Sections 1 and 7 3.0 GENERAL INFORMATION REGARDING THE STUDY AREA The purpose of this investigation was to evaluate the concerns regarding high water conditions based on a review of design information, field reconnaissance, and the collection and analysis of water‐level monitoring data from various locations in the immediate vicinity of the study area. This section of the document also provides a general description of the watersheds associated with the study area and a timeline of the City’s public involvement process that occurred as a component of this stormwater investigation. 3.1 Brief History of Study Area The City of Westerville Planning Commission and City Council approved the Mariners Cove emht.com | 4 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 development site in the early 1990s with the requirement that the existing woodlands, wetland areas, and streams be preserved and protected to the extent possible. The construction of the development occurred throughout the 1990s, with Section 1 of Mariners Cove being platted in August 1991 and Section 7 being platted in December 1999. The stormwater management system for Sections 1 and 7 of the development, as well as adjoining development areas, was designed to include underground storm sewer pipes with surface inlets to transmit a portion of the stormwater runoff, along with no build zones and easements to permit overland surface water routing between houses and within public streets. In addition, the site was planned and designed around existing wetland areas both external to and, in some cases, within platted lots. The recorded plats for Sections 1 and 7, as well as Section 6, include provisions and restrictions for the protection of environmentally sensitive areas, which was a condition of the City’s original approval and permits issued by the U.S. Army Corps of Engineers related to the limited filling of existing wetlands at the time of development of each section. The recorded plats for the subdivision and deed restrictions define the purpose and the limitations associated with the designated wetland preservation areas, easements, and other no build zones. The wetlands located within and abutting portions of the subdivision have been designated as such due to their natural soils, hydrology and vegetation, making them prone to the collection of water that may be present on a seasonal or permanent basis. Limitations included on the recorded plats and further defined in the deed restrictions associated with the subdivision prohibit any buildings, sheds, slabs, recreation equipment, paving, dirt fills, grading, other structures or land disturbing activities which would alter the wetland areas from their natural state. As such, it is required these areas be kept in a natural state with wetland plants and grasses that are not to be mowed or maintained as lawn areas. In addition, these restrictions note that dedicated "No Build Zones" may hold water during and after infrequent heavy rains and that no use shall be permitted in these areas that would interfere with or be damaged by this water retention. A summary of the plat and deed restrictions for Sections 1, 6 and 7 is provided for reference in Appendix B. The City of Westerville has adopted and enforces standards for the design of stormwater management features in conjunction with development sites. The stormwater management design followed the City’s standards in place at the time each section of the subdivision was constructed. These standards required the storm sewer system to have a certain capacity, with the understanding that stormwater runoff in excess of that capacity with the ability to attenuate within the designated wetlands and route through designated portions of lots and within public streets, accounting for flows up to the 100‐year storm event. The standards allowed for the depths of water within public streets be such that public service and emergency vehicles still had through access. 3.2 Watershed Description emht.com | 5 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 The off‐site watershed area impacting Sections 1 and 7 of Mariners Cove is approximately 200 acres, extending west of North Spring Road and north of Maxtown Road. Spring Run has approximately 2,000 acres tributary to it north of Maxtown road. These areas are shown on Exhibit 3 in Appendix A. The land use of the off‐site watershed has changed to some degree since the time of the original site design for Mariners Cove. No effort has been made to analyze the impact of these changes on stormwater runoff as it impacts Sections 1 and 7. It is possible that runoff volumes have increased in these areas; however, further technical analyses would be necessary to quantify these changes and their impact on drainage conditions within Mariners Cove. The expansive wetland areas adjacent to the development site serve to provide a buffer as the wetland areas have an inherent ability to capture, detain and absorb stormwater runoff, which could be accounted for in a watershed‐level analysis. The impact of Spring Run based on the overall watershed may have an effect on the local drainage conditions. One of the purposes of the water‐level monitoring program described in Sections 5.0 and 6.0 of this report is to determine the potential relationship between water levels in Spring Run and the observed high water conditions impacting Sections 1 and 7 of the subdivision. 3.3 Public Interaction The following is a timeline of specific events related to the City’s involvement with local property owners during the course of the stormwater investigation. This interaction has allowed the City to gather additional information regarding the observed high water conditions and also explain the on‐going stormwater investigation. Informative brochures and fact sheets have been mailed to property owners and have been made available at public meetings. A copy of the brochure is included in Appendix C. We understand this summary may not represent the full extent of interaction between the City and the residents related to drainage concerns at Mariners Cove, but it does provide some context for our understanding of the nature of the residents’ drainage concerns in the study area. On October 24, 2011, the City hosted a meeting in Council Chambers with a number of Mariners Cove residents. The history of the development of Mariners Cove and its unique storm water management system was discussed and explained; the residents shared photos and videos of storm drainage events and expressed concerns regarding storm drainage. On December 8, 2011 the City notified residents and the Mariners Cove Homeowner's Association (HOA) of the intent to complete an initial stormwater investigation of the area, and that data collection and water‐level monitoring associated with this investigation would extend over a twelve month period. Residents were also advised of the City’s intentions to modify six storm inlet structures to address maintenance issues and improve their ability to capture stormwater runoff. During January and February of 2012, the City notified residents that City crews would be removing fencing and performing modifications to existing drainage structures in order to reduce potential clogging of inlets. The residents were also informed that EMH&T would be emht.com | 6 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 installing water‐level monitoring equipment and rain gauges in the area. On June 11, 2012 the City notified residents and the Mariners Cove HOA that field crews with surveying equipment would be on site for approximately two weeks to stake property lines, no build zones, wetland preservation area boundaries, and drainage easements, as well as to obtain spot grade elevations within the area. Also in June of 2012, City staff inspected a stormwater management facility located upstream of Mariners Cove and it was confirmed the facility was constructed and is performing in accordance to the approved plans. On July 5, 2012, the City hosted a meeting in Council Chambers with Mariners Cove residents to provide an update on the stormwater investigation. Representatives from the Ohio EPA and Otterbein University were also in attendance. City staff again shared the history of the development of Mariners Cove and its stormwater management system. An overview of the on‐going investigation was provided and modifications to existing storm inlet structures in the area of Sections 1 and 7 of the development site were discussed. The on‐going water‐level monitoring program was discussed and the residents shared their concerns regarding storm drainage in the area and impacts on their property. Additional details regarding the resident’s concerns are provided in Section 4.3 of this report. On August 30, 2012, the City held a public a meeting at the Westerville Community United Church of Christ with Mariners Cove residents to provide an update on the stormwater investigation. Residents from the adjoining Landings at Hoover were also present. City staff once again shared the history of the development of Mariners Cove and its stormwater management system. An update of the on‐going water‐level monitoring program was provided. Also discussed were the residents’ encroachments into wetland areas, easements and no build zones. 4.0 REVIEW OF EXISTING INFORMATION The purpose of this section of the report is to present and discuss findings related to the existing storm sewer system. For the most part, this is a general discussion related to field reconnaissance and observations of the physical condition of the system, including storm inlet modifications performed by the City to address maintenance issues that were impeding flow from getting into the underground storm sewer system. This section also discusses the observations of high water within Sections 1 and 7 of the development site, as documented by the residents. 4.1 Existing Storm System The existing storm system within the study area is shown on Exhibit 1 in Appendix A, and shown again in more detail on Exhibit 2 in Appendix A. The storm sewer system constructed as part of Sections 1, 6 and 7 included the outfalls to Spring Run and extension upstream to the storm inlets along Bay Drive, Sunbury Lake Drive, and Inlet Court. When Section 6 of the subdivision emht.com | 7 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 was constructed, the 48‐inch x 76‐inch elliptical storm pipe was extended to the western property line and then north to serve that section. In addition, a short section of storm piping was constructed toward the west. This pipe terminates with a bulkhead that is approximately 7 to 8 feet below the existing ground. This section of pipe does not have a surface inlet and is not currently receiving stormwater runoff from the upstream watershed. The original development concept for the adjacent offsite area included a subdivision west of Sections 1 and 7. This pipe was included in the Section 6 plans to facilitate drainage upon development of the future subdivision. As a routine component of the site development process, as‐built plans were prepared for the various sections of the Mariners Cove subdivision, verifying the constructed public infrastructure improvements. An as‐built plan represents a field survey of the storm sewer system, including pipes and surface inlets, to verify the locations and elevations of these features. General conformance with the approved plans is required prior to the developer being permitted to construct houses on the individual lots. The as‐built drawings that were prepared as a part of the construction of each section confirmed compliance with the approved plans. In order to establish current conditions, a field survey was performed as part of this investigation. This was to determine if elevations of the overland high water routing paths in this area had changed over time or have been affected by construction on the individual lots. The field survey focused on the elevation of the existing roads, as well as specific locations where the overland routing is through residential lots. From this effort, we determined the overland routing for the area surrounding Sections 1 and 7 of the study area still conforms to the original approved engineering plans. Elevations obtained on critically located basement widows confirmed that these were above the adjacent design high water elevation and not subject to water entry during high water events. The field survey also verified that high water levels in the public roads, even under extreme conditions, would allow for the passage of public service and emergency vehicles to and from homes within the subdivision. The design calculations for the storm sewer system were based on the standard engineering practices and the regulations adopted by the City of Westerville that were in place at the time each section of the subdivision was developed. Those standards mandated that the underground storm sewer system have the capacity to contain up to the 5‐year storm event. Flows greater than a 5‐year storm event would initially accumulate within wetlands, lots and streets, then flow between lots and within streets before flowing overland, between lots, into Spring Run. The standards also required that sufficient overland routing be provided on individual lots and within the streets to accommodate stormwater runoff up to the 100‐year storm event. The engineering plans provided site grading elevations and accompanying easements (also designated as no‐build zones) to accommodate the potential for overland routing of stormwater. Due to the large off‐site watershed area west of Section 1 and 7, these no‐build zones are wider than in a typical subdivision setting. The no‐build zones are also shown on the accompanying subdivision plats along with the appropriate language designating and emht.com | 8 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 limiting their use. Language for these restrictions within these areas was also included as a part of the deed restrictions that accompanied each section of the subdivision. The existing storm sewer system was designed to convey typical or average rainfall events based on a historical perspective. The average annual rainfall in the City of Westerville over the past 30 years is 38.52 inches. The average rainfall for the past 10 years is 43.15 inches, or approximately 12% above the 30 year average. The rainfall in 2011 was 59.5 inches or 54% above the 30 year average rainfall. The many back to back rainfall events, in conjunction with constantly saturated soil conditions, most likely contributed to the frequency of high water events during this year. A graph depicting the annual rainfall in the City is included as Appendix F. 4.2 Field Reconnaissance and Maintenance Activities The stormwater investigation included field reconnaissance to provide a condition assessment of the existing storm system in the immediate vicinity of Sections 1 and 7 of the development site. This reconnaissance included observations of surface inlets and, to the extent possible, observations of the storm pipes. The result of this effort was the finding that there were no obstructions or other physical conditions within the underground storm system that would reduce its capacity to operate as it was originally designed. However, two storm inlets were found not to be operating to capacity due to clogging as a result of vegetation getting caught in fencing that had been placed around these inlets. Another inlet was found to have a granite walk/bridge placed over it. It was also noted that at various locations, fencing had been placed across the stream within the wetland preserve north of Inlet Court. This fencing was clogging and impeding stream flow. The structures, as well as the rest of the storm sewer system, are contained in platted easements and are owned by the City of Westerville, which bears the responsibility for maintenance of these structures and has done so on a continuous basis. A recommendation was made to modify five inlets to be less prone to clogging while also improving their capacity to receive stormwater runoff. There was a sixth storm structure with a solid lid that was converted to a grated lid to allow additional groundwater flow into the storm sewer system. In addition, the fencing was removed from the stream and the walk/bridge was removed from the structure. This work was completed by early March 2012. The location of these modified structures is shown on Exhibit 2 in Appendix A. Figure 2 depicts the typical modifications as performed on two of these structures. These modifications were not intended to provide drainage to isolated low areas within the rear yards of lots within the subdivision, but only to ensure the existing inlets would properly receive the stormwater runoff currently discharging to those locations. This activity appears to have provided a benefit to the overall performance of the storm system. Prior to the modifications, lower rainfall event stormwater runoff that would be expected to get into and be conveyed by the existing storm sewers was instead routed toward and through the properties within Sections 1 and 7 of the development. emht.com | 9 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 As part of the field reconnaissance process, it was discovered that the home at 1016 Inlet Court had a sump pump discharging to the existing storm inlet structure located behind (north of) the residence. Typically, a sump pump would discharge to the downspout drains that would discharge through the curb line and into the street. The current configuration poses a risk to the homeowner. Rising water levels in the storm inlet during periods of rainfall would impede the performance of the sump pump, or even overwhelm it, and lead to water backing up into the basement of the home. It is unknown if there are other instances similar to this in the study area. Recommendations for addressing this condition are provided in Section 7.1. A significant component of the field reconnaissance was field staking the platted limits of property lines, easements, wetland preserves and other no‐build zones on the individual lots within Sections 1 and 7 of the study area. As mentioned previously, there are also deed restrictions associated with the protected areas and limiting the use of these portions of the platted lots. The restrictions on specific lots are necessary to prevent damage to landscaping, fences and outbuildings (sheds), which could also damage other adjacent properties by disrupting the flow of stormwater runoff through the study area. These areas are shown and labeled on Exhibit 2 in Appendix A, which also depicts the proximity of homes and other site improvements to those areas. To provide an on‐the‐ground illustration of this proximity, the boundaries of these noted areas were staked in the field. This exercise identified numerous encroachments into protected wetlands and no‐build zones that all have some relevance to the conveyance of stormwater runoff within and around the development site. This also identified the close proximity some houses were constructed to the overland routing limits, and in some cases, against these limits. The photos in Figure 3 depicts various examples of these encroachments, which includes portions of homes, driveways, landscaping features, play equipment and mowed lawns (which is not permitted within the designated wetland preserve areas). These photos also show the proximity that houses were constructed in relation to these limits. Even though the various protected areas are on individual lots and in close proximity to homes, the cited legal documents are explicit regarding the limitations to the allowable use of these areas. More importantly, these protected areas are associated with the conveyance and storage of stormwater runoff and any encroachments are presumed to be subject to periodic high water. Having homes and related site improvements in close proximity to critical stormwater/wetland features is not typical and does present a challenge in terms of addressing the concerns of high water in vicinity of these homes. emht.com | 10 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURE 2: Modified Storm Inlets Fencing removed and inlet modified to improve performance Obstruction removed and inlet modified to improve performance emht.com | 11 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURE 3: Field Review of Protected Areas Figure 3A: Section 7 ‐ 571/587 Lighthouse Court (Looking South) Encroachments within the platted wetland preserve: landscaping, mowed lawns. Platted wetland area shown hatched. emht.com | 12 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 3B: Section 7 ‐ 587 Lighthouse Court (Looking Northwest) Encroachments within the platted wetland preserve: landscaping, mowed lawns. Platted wetland area shown hatched. emht.com | 13 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 3C: Section 1 ‐ 1000 Inlet Court (Looking south) Encroachment into No Build Zone: walk, landscaping, grading. No Build Zone / Water Routing Limits hatched. emht.com | 14 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 3D: Section 1 – 990 Inlet Court (Looking East) Encroachments within the platted no‐build zone: shed and walks. No Build Zone hatched. emht.com | 15 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 3E: Section 1 – 990 Inlet Court (Looking East) City wetland preserve being maintained as lawn area. Play equipment within City wetland preserve. Landscaping, building, walks within no build zone. City wetland and No Build Zone hatched. 4.3 Documented High Water Events Residents have documented their observations of high water on and around the residential lots within Mariners Cove, including events in February 2011, July 2011, October 2011, May 2012, October 2012, and June 2014. The extent of high water is within yard areas behind and adjacent to homes and appears to coincide with rising water in the wetland areas adjacent to the subdivision. There are at least three known events that have occurred following the modifications to storm sewer inlets made by the City, and the water‐level monitoring program begun in early 2012 has captured these events, which are described in the following sections of this report. Figures 4, 5 and 6 include photographs of the high water events provided by area residents. Overland routing for rainfall events that exceed the design year capacity of the storm sewer system can lead to high water at the intersection of Bay Drive and Inlet Court. The photos emht.com | 16 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 associated with the summer 2011 high water event show surface water swirling at the inlets at the intersection. This suggests that the underground storm sewer system at that location appeared to have capacity for additional surface flow. This is most likely the result of stormwater runoff bypassing the upstream storm inlets due to clogging at the inlets. Public service and emergency vehicles were still able to traverse the area. It should be pointed out that the majority of the photos and videos that have been provided by the residents were taken during 2011. As previously mentioned, that year was one the wettest years on record for Westerville. There was a direct correlation between this and the frequency of events and residential concerns. Discussions with some of the long time (even original) residents captured their assertions that water conditions have gotten worse over time. They might have this perception since Mariners Cove was constructed during a time with lower than average rainfall. Recent years, especially 2011, have been have a higher than average rainfall. The graph in Appendix G shows the time frame in which the subdivision was constructed in relation to average rainfall. EMH&T staff has not witnessed high water conditions in Sections 1 and 7 of the study area; however, we have reviewed videos and photos provided by the residents for specific high water events. Below is a summary of our observations regarding several recorded storm events since the inlet modifications and monitoring program began in March 2012:  The videos and photos appear to show water generally within the limits of the designated wetland areas, no‐build zones, and easements within the study area. 
The inlets that had fencing placed around them were an on‐going maintenance issue and required vigilance on the part of the City and homeowners to clear debris from the fencing. The modified inlets seem to have improved the conveyance of the stormwater runoff up to the design year storm events. Stormwater runoff that exceeds the underground design year capacity appears to be accumulating within the wetlands, easements and no build zones as per the approved design. 
There is a concern noted on a video regarding the extended period of flowing and standing water, as well as saturated ground conditions; however, these areas appear to be associated with the designated wetland preserve where this condition should be expected following a rainfall event. In the July 5, 2012 public involvement meeting conducted by the City, several of the resident’s concerns were reiterated along with clarification of other drainage issues. Namely, there was a discussion as to how the stormwater conditions potentially were being exacerbated by other developments in the upstream watershed and that stormwater seems to be flowing from south to north through the wetland preserve. emht.com | 17 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURES 4A‐B: Photo Documentation of High Water Events (October 2011) Figure 4A: Section 7 – 571 Lighthouse Court (Looking North)
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Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 4B: Wetland west of 571 Lighthouse Court (Otterbein property) emht.com | 19 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURES 5A‐B: Photo Documentation of High Water Events (February 2011) Figure 5A: Section 1 ‐ 1016 Inlet Court (Looking North) Water within no build zone. No Build Zone hatched. emht.com | 20 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 5B: Section 1 ‐ 1016 Inlet Court (Looking West) Water within no build zone. No Build Zone hatched. emht.com | 21 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 FIGURES 6A‐B: Photo Documentation of High Water Events (Summer 2011) Figure 6A: Section 1 ‐ Inlet Court and Bay Drive (Looking Northwest) Water 7” to 8” above center of roadway. emht.com | 22 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 6B: Section 1 ‐ Bay Drive Service vehicles driving down street during high water event. emht.com | 23 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 5.0 WATER‐LEVEL MONITORING PROGRAM The purpose of this section of the report is to present and discuss findings related to a water‐
level monitoring program conducted between February 2012 and December 2013 within Sections 1 and 7 of the development site. The main purpose of the monitoring program is to determine the relationship between the various components of the drainage system in this area, including the Spring Run channel and the two separate storm sewer systems that accept runoff from Section 1 and 7 and offsite areas. These findings may allow us to draw conclusions regarding the frequency of high water events and how various improvements would potentially lessen the frequency of high water events. This section includes a description of the monitoring locations, the equipment used and a summary analysis of the collected rainfall and water‐level data. 5.1 Overview of Monitoring Program Water‐level monitoring equipment was initially installed at three locations (meter nos. 1, 2 and 3) within Mariners Cove, as shown on Exhibit 2. We have been collecting data since February 1, 2012. At the request of the residents, two additional water‐level meters (nos. 4 and 5) were installed on September 12, 2012 at 571 and 587 Lighthouse Court. At the request of one of the property owners, the meter originally located at 587 Lighthouse Court (no. 4A) was moved to a location at 571 Lighthouse Court (no. 4B) in December of 2012. The rainfall gauge used for the study was originally located at 1016 Inlet Ct. This gauge was replaced and moved north of Westerville Central High School at 6302 Andrews Drive West, closer to the centroid of the Spring Run watershed and within 1.35 miles of the study area. Table 1 provides a summary of equipment locations and elevations, and the active dates for each gauge. Figures 7 A‐F are photos of each installed meter location. 5.2 Description of Water‐level Monitoring Equipment Below is a summary list of the monitoring equipment used as part of this investigation.  Water level meters (and accompanying barometric pressure meter): Solinst Levelogger Edge Model 3001 The water level meters take a water pressure or barometric pressure reading every 10 minutes continuously. During dry conditions the meters are above the normal water level and take barometric pressure readings; when submerged, the pressure reading is a combination of barometric pressure and water pressure. A separate barometric pressure meter was placed at EMH&T’s office at 5500 New Albany Road so that a barometric correction can be applied to the raw pressure data when the data is processed to negate the effects of barometric pressure changes associated with high and low pressure weather systems. Per the manufacturer, the barometric pressure gauge can be installed anywhere within 20 miles of the water level meters and provide an accurate correction for barometric pressure changes. emht.com | 24 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 
Rainfall Gauge: Young Tipping Bucket Gauge; replaced by an ISCO 674 Tipping Bucket Rain Gauge The rain gauge measures rainfall over time (taking a cumulative measurement every 10 minutes), thus providing a total rainfall depth and time distribution of rain. The collection of data from the original installation was compromised by problems with the data logger; however, with the replacement gauge installation, rainfall data has been available since July of 2012. emht.com | 25 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Table 1: Monitoring Equipment Summary Location Location Start End Sensor Meter (Street Address) (Description) Date Date Elevation Spring Run Feb. Aug. 1 584 Bay Drive 884.50 Channel 2012 2014 Feb. Aug. 2 1016 Inlet Ct. Catch Basin Invert 885.81 2012 2014 Feb. Aug. 3 1016 Inlet Ct. Channel Invert 889.25 2012 2014 587 Lighthouse Adjacent to Storm Sept. Dec. 4A 891.70 Ct. Manhole 2012 2012 571 Lighthouse Dec. Aug. 4B Existing Ground 893.02 Ct. 2012 2014 571 Lighthouse Below Storm Inlet Sept. Aug. 5 888.35 Ct. Grate 2012 2014 Feb. July ‐‐ 1016 Inlet Ct. Rain Gauge N/A 2012 2012 6302 Andrews July Aug. ‐‐ Rain Gauge N/A Drive West 2012 2014 Figure 7: Meter No. 1 at Spring Run, Looking East emht.com | 26 of 41
Adjacent Grade 884.06 885.12 888.60 891.87 892.30 892.29 N/A N/A Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 8: Meter No. 2 at 1016 Inlet Court, Looking North Figure 9: Meter No. 3 In Wetland Behind 1016 Inlet Court, Looking North emht.com | 27 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 10: Meter No. 4A Location at 587 Lighthouse Court, Looking Northwest (Photo taken before meter relocated to 4B) (Note sump pump discharge pipe installed by residents in order to drain backyard wetland area) Figure 11: Meter No. 4B at 571 Lighthouse Court, Looking South emht.com | 28 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 12: Meter No. 5 at 571 Lighthouse Ct. Looking West 6.0 ANALYSIS OF WATER‐LEVEL MONITORING DATA This section provides a summary discussion of the collected data, as well as a more detailed discussion of three of the larger rainfall events that occurred during the monitoring period. We have also provided summary observations with respect to the data collected at each of the monitoring locations. Two of the water‐level meters were installed later in the timeframe of this stormwater investigation, which has limited our observations at those locations. 6.1 Description and Analysis of Graphed Data Water level graphs have been provided in Appendix D for the larger rainfall events observed within the time period of the stormwater investigation. Each graph has up to six series of data showing water elevation over time along with a corresponding rainfall distribution when available. The graphed rainfall events are listed in Table 2. The peak record elevations for each meter are provided in Table 3. Not every event was graphed; in many cases, water level changes were only observed at Spring Run. Only rainfall events that resulted in a measurable increase in Spring Run water levels were graphed. In addition, events that triggered a measurable water level in meter nos. 2, 3, 4A, 4B, and 5 were graphed. emht.com | 29 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Table 2: Graphed Rainfall Events Total Rainfall Depth Event Date Storm Duration (inches) 1 March 8, 2012 0.33 10 hours 2 May 2, 2012 1.70 n/a 3 June 1, 2012 0.78 n/a 4 June 29, 2012 1.10 n/a 5 July 26, 2012 1.15 1 hours 6 September 2, 2012 2.47 1.5 hours 7 September 8, 2012 0.66 8 hours 8 September 21, 2012 1.18 4 hours 9 September 27, 2012 0.72 14 hours 10 October 2, 2012 0.40 40 minutes 11 October 5, 2012 0.51 5 hours 12 October 28, 2012 0.73 9 hours 13 November 12, 2012 0.64 9 hours 14 December 4, 2012 0.72 4.5 hours 15 December 7, 2012 0.95 18 hours 16 December 20, 2012 0.92 11 hours 17 January 12, 2013 0.00* * 18 March 18, 2013 0.65 6 hours 19 June 29, 2013 1.70 3.5 hours 20 July 8‐10 2.16 2.5 days 21 September 21, 2013 2.20 n/a 22 October 6, 2013 3.20 n/a 23 December 21‐23, 2013 1.94 29 hours* 24 February 20‐22, 2014 0.00* 38 hours* 25 April 3‐4, 2014 1.23 31 hours 26 May 12, 2014 1.07 4 hours 27 June 19, 2014 1.32 4 hours 28 June 24‐25, 2014 2.64 6 hours 29 July 7, 2014 1.10 40 minutes 30 August 1, 2014 1.27 90 minutes n/a – rainfall data acquired from NOAA Gauges, storm duration not available *snow melt event emht.com | 30 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Meter No. 1 2 3 4A 4B 5 Table 3: Peak Water‐level Elevations Meter Highest Recorded Date Elevation Elevation 884.50 888.21 June 25, 2014 885.81 891.77 June 25, 2014 889.25 891.48 June 25, 2014 891.70 892.38 Sept. 22, 2012 893.02 893.34 Feb. 20, 2014 888.35 888.72 June 25, 2014 The following is a summary of specific observations related to rainfall events that occurred on May 2, 2012, September 2, 2012, September 21‐22, 2012, and June 24‐25, 2014. These observations pertain to the graphed monitoring data collected from those events and provided in Appendix D. September 2, 2012 Rainfall Event The most intense recorded rainfall event during the monitoring period occurred September 2, 2012, which was 2.47 inches in approximately 90 minutes starting at roughly 4:20 AM and ending by 6:00 AM. This rainfall correlates to a 25‐year event based on total rainfall depth and duration. This determination is derived from the published NOAA Atlas 14 Frequency‐Rainfall Depths information, summarized in Table 4. The following observations were taken from the water‐level graphs developed for this event. The water‐level meters at 571 and 587 Lighthouse Court were not installed when this event occurred.  Water levels in the Spring Run channel rose quickly after the storm and initially coincided with the elevation of the wetland behind 1016 Inlet Court, peaking at an elevation of 888.09.  The peak water level in Spring Run was below the lowest roadway gutter elevation at the intersection of Bay Drive and Inlet Court (889.59); to the best of our knowledge, no street flooding occurred at this location.  The water levels in the storm inlet and wetland area adjacent to 1016 Inlet Court peaked about 2 hours after Spring Run peaked, with the highest water elevation being 891.27.  A debris line was seen in the side yard of 1016 Inlet Court but it did not appear to extend to the street (refer to the photo in Figure 8). The debris was within the no build zone / high water routing path.  As expected, water levels in Spring Run took much longer to subside back down to base flow levels (>20 hours), whereas water levels in the wetland rose, peaked, and dropped back below the meter elevation within 4 hours.  The removal of fencing along the wetland stream and modifications to the storm inlets within Sections 1 and 7 of the study area appeared to prevent previously noted clogging emht.com | 31 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 issues, allowing surface drainage to be intercepted by the inlets and conveyed to the storm sewer system, and reducing water levels at Inlet Court. Table 4: NOAA Atlas 14 Frequency Rainfall Depths (inches) Westerville (NOAA Station 33‐8951) Recurrence Interval Storm Duration 1‐year 2‐year 5‐year 5‐min 10‐min 15‐min 30‐min 1 hour 2‐hour 3‐hour 6‐hour 12‐hour 0355 0.551 0.675 0.894 1.09 1.28 1.36 1.61 1.89 0.424 0.662 .809 1.08 1.33 1.55 1.64 1.94 2.27 0.508 0.790 0.970 1.33 1.67 1.95 2.06 2.42 2.81 10‐year 25‐year 50‐year 0.574 0.886 1.09 1.51 1.93 2.26 2.39 2.81 3.26 0.657 1.01 1.24 1.75 2.27 2.69 2.85 3.37 3.90 0.721 1.09 1.35 1.93 2.55 3.04 3.23 3.83 4.44 100‐year 0.782 1.18 1.46 2.11 2.82 3.40 3.62 4.32 5.01 Figure 13: Debris Line on West Side of 1016 Inlet Court, Looking North toward Meter No. 2 After September 2, 2012 Rainfall Event (All debris is within the No Build Zone / Water Routing Limits) emht.com | 32 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 September 21‐22, 2012 Rainfall Event The largest single rainfall event after the installation of meter nos. 4 and 5 on Lighthouse Court occurred on September 21‐22, 2012, which consisted of 1.18‐inches in approximately 4 hours starting at roughly 10:00 PM and ending by 2:00 AM, correlating to less than a 1‐year event based on the observed depth and duration (refer to Table 4). The following observations were taken from the water‐level graphs developed for this event.  The water level in the Spring Run channel rose quickly and peaked at roughly elevation 886.0, well below the lowest roadway gutter elevation at the intersection of Bay Drive and Inlet Ct. (889.59)  Water levels were not significant enough to activate meters nos. 2 and 3 at 1016 Inlet Court or meter no. 5 located in the storm sewer at 571 Lighthouse Ct.  Shallow water levels were recorded at meter no. 4 at 587 Lighthouse Ct. May 2, 2012 Rainfall Event The second largest single rainfall event during the study period consisted of approximately 1.70‐inches. The daily total rainfall for two NOAA rainfall gauges within Westerville, one north of the site and one south ranged from 1.50 to 1.90 inches. The following observations were taken from the water‐level graphs developed for this event. The water‐level meters at 571 and 587 Lighthouse Court were not installed when this event occurred.  As was observed with the September 2 event, Spring Run rose quickly and created a tailwater condition in the storm sewer at meter no. 2.  Water levels in the wetland at 1016 Inlet Ct. peaked after Spring Run.  The Spring Run peak water level was over three feet lower than the recorded water level at 1016 Inlet Court and consequently did not have an impact on the wetland elevation. June 24‐25, 2014 Rainfall Event The largest total depth rainfall event during the monitoring period occurred June 24‐25, 2014, which was 2.64 inches in approximately 6 hours, with an additional 0.15 inches several hours later. This rainfall correlates to a 5‐10 year event based on total rainfall depth and duration. This determination is derived from the published NOAA Atlas 14 Frequency‐Rainfall Depths information, summarized in Table 4. As previously stated, an event of this magnitude will exceed the design capacity of the underground storm sewer system, which will then result in overland routing of stormwater. This particular event produced the highest recorded water levels for the study period. The central wetland exceeded maximum capacity, which resulted in overland flow occurring. A previous 1.32‐inch rainfall event on June 19 likely exacerbated the runoff from this event due to ground saturation and reduced wetland capacities. The following observations were taken from the water‐level graphs developed for this event, along with videos provided by the residents. emht.com | 33 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 



The rainfall event had three heavier downpours in the first 6 hours, resulting in a bump in the Spring Run water level after each downpour. Two of the downpours had recorded rainfall depths of over 0.40 inches in 10 minutes. The peak water level in Spring Run (888.21) was below the roadway gutter elevation at the intersection of Bay Drive and Inlet Court (889.59); Overland flow from the wetland resulted in high water inundating the roadway at 1000/1016 Inlet Court. However, as per design, once the water reached maximum depth at the inlets, excessive flow routed down Inlet Court and to Bay Drive, and eventually to Spring Run. The water levels in the storm inlet and wetland area adjacent to 1000/1016 Inlet Court peaked about 1 hour after Spring Run peaked, with the highest water elevation being 891.77, approximately 6‐inches higher than the September 2, 2012 event. Resident videos showed high water in the side yard area between 1000/1016 Inlet Court, and over the sidewalk and curb along here. This area between the houses is platted as a “No Build Zone” in order to allow for the transmission of excess water from the wetland to Inlet Court. emht.com | 34 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Figure 14: Overland routing of flow from the 1000/1016 Inlet Court “No Build Zone” to the street during June 24‐25, 2014 rainfall event, after peak elevation. Orientation of photo. See Exhibits 2 and 4 for legend. emht.com | 35 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 6.2 Conclusions from Data Analysis Based on the analysis of the data collected at the five monitoring locations during the period of this study, we are providing the following summary conclusions regarding the response of the storm system to rainfall events. Some of these conclusions would need to be corroborated through a technical analysis of the various watershed areas contributing stormwater runoff to these systems. Meter No.1: Spring Run Channel  Rises quickly, but takes longer to subside. Indicative of a developed watershed with significant amounts of impervious area and stormwater management systems.  The larger watershed area and controlled release of volume from detention basins likely contribute to the long time period of measured high water in comparison to the wetlands.  Water levels have not risen to an elevation higher than the lowest roadway elevation at the intersection of Bay Drive and Inlet Court. Meter Nos. 2 and 3: at 1016 Inlet Court  A small amount of base flow is usually observed in the stream channel that discharges to the storm structure where meter no. 3 is located.  Peak high water elevations are delayed compared to the peak elevations in the Spring Run channel, likely due to the ability of the upstream wetland to capture and detain stormwater runoff.  The duration of high water is much shorter than in the Spring Run channel, likely due to a smaller watershed area and less total runoff volume.  Spring Run has controlled the water elevation at meter no. 2 during the larger observed rainfall event events, which is at the invert of the storm pipe system, but has not been higher than the surface elevation of the wetland.  Overland flow routing from the wetland to Inlet Court occurred on one occasion during the study. This was the result of a 2.64‐inch rainfall event in 6 hours, along with high antecedent moisture conditions from a 1.32 inch rainfall event 5 days earlier. Meter 4A ‐ 587 Lighthouse Court  A small channel has eroded from the adjacent wetland to the manhole structure; the flow then runs down the side of the manhole and enters the manhole through section joints and/or into the bedding and storm sewer pipe joints.  The wetland to the west on the Otterbein property and the platted wetlands on this lot and at 571 Lighthouse Court combine to operate as one large wetland during heavy runoff events.  Meter was relocated to the 4B location at the request of the property owner at 571 Lighthouse Court. emht.com | 36 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 Meter 4B ‐ 571 Lighthouse Court Rear Yard  Rises in water level have been recorded during the larger events.  The wetland to the west on the Otterbein property and the platted wetlands on this lot and at 587 Lighthouse Court combine to operate as one large wetland during heavy runoff events.  During larger events, flow is noted to be moving generally from south to north. Meter 5 ‐ 571 Lighthouse Rear Yard Catch Basin  Meter is located below the top of casting in an existing storm sewer structure, but above the invert of the pipe.  Meter would not be able to measure elevations above the top of structure. Surface water elevations are better represented by observation made by meter 4B.  During larger events the inlet was submerged. However, a slow moving vortex above it indicated that it was draining. Due to the type of grate on the structure, the inlet capacity is relatively low may get clogged with debris.  The outflow pipe in this structure is a 76”x48” pipe with an invert of 885.64, and an inside top of pipe of 889.64. During the June 24‐25, 2014 event, a peak water level of 888.67 was recorded in the pipe, which was 0.46 feet above the Spring Run elevation (888.21). The difference in water elevations between the structure and Spring Run is due to hydraulic losses in the storm system. 7.0 CONCLUSIONS The completed stormwater investigation relies primarily on a review of design and record information for Sections 1 and 7 of the Mariners Cove subdivision, observations of high water provided by the residents and the results of a water‐level monitoring program that began in early 2012. During the majority of the monitoring period, there were a few rainfall events that resulted in localized high water conditions within the study area, but not to the extent demonstrated in some of the older photos and videos provided by residents. The one exception is the June 24‐25, 2014 event, which resulted in the routing of flows overland and along roadways. The previous efforts to prevent debris from clogging storm inlets in this area by placing fencing around these inlets may have actually exacerbated the problem by causing low frequency stormwater runoff to route overland and, eventually, to streets within the subdivision. The modification to those inlets completed by the City appears to have addressed a portion of the concerns. A section of the existing underground storm sewer system may be under‐utilized for the smaller, more frequent, rainfall events. The storm sewer pipe that was “stubbed” west of Lighthouse Court and was designed to be extended to service future development could possibly receive additional stormwater runoff from a portion of the upstream watershed. emht.com | 37 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 The low areas on some lots in Sections 1 and 7 are almost exclusively associated with protected areas designated as easements, no‐build zones and wetland preserves. There are specific covenants to protect these areas from encroachments and improvements that would interfere with the intended drainage and/or would interrupt the natural conditions associated with a designated wetland. These are protected areas specifically designated to convey and potentially hold stormwater (as specifically stated in the recorded deed restrictions), and homes have been constructed in close proximity to them. In some cases, the houses have been constructed almost directly on an easement, no build line, or water routing path line, thus allowing water to come nearly up to the house itself. In addition, homeowners have made other improvements on some lots that are not permitted uses within these protected areas, including maintaining mowed lawns in the wetland preserve areas. It is these areas that seem to be the most prone to frequent and sustained periods of ponding water, as they were intended to be. The wetland preserve areas established as part of Sections 6 and Section 7 of Mariners Cove represent regulatory restrictions to the implementation of any large‐scale drainage improvements; most notably the installation of drainage structures and/or the placement of fill or other grading that would disturb the expected natural function of these wetlands. Clearly, the wetland preserve areas on lots in Section 7 are no longer functioning as wetlands due to the encroachments noted above; however, this does not change the regulatory limitation on present and/or future activities in this area. Regardless, there are possible improvements that may alleviate some of the existing stormwater conditions in this area. In addition, it is possible future studies to examine the larger watershed area upstream of this study area would identify various improvements to reduce the amount and/or rate of stormwater flowing to and through the wetland areas surrounding Sections 1 and 7. These measures should be restricted from altering the hydrology of the wetlands, but they could still possibly provide a benefit in reducing the frequency and duration of high water events within the study area. In addition, it is prudent to continue advising the residents of their obligation to abide by the legal restrictions placed on certain portions of their properties, at least to the extent they understand the risks and liabilities associated with the current encroachments, and the intent or the limits of the high water routing paths. In summary, all indications are that the stormwater system within the study area is operating as to the original design and intent of the approved plans. This conclusion is further reinforced by June 24‐25, 2014 storm event, the data collected, and the video provided by the residents. The high water elevations do not appear to have exceeded the original design. No records have been provided that indicate any surface water entered through any opening in any house perimeter. Any water in basements, as stated by several residents, would be attributed to sump pump issues (failure, inadequate size, improper discharge connections, etc.). The frequency of high water events is most likely the result of runoff from the upstream watershed as previously discussed. emht.com | 38 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 7.1 Storm System Modification Alternatives Based on the information collected and reviewed throughout this investigation, there are a number of options that may be performed that will educate the public and may reduce the frequency of high water events. Homeowner Education 1. Homeowners should be advised on appropriate sump pump discharge locations. Sump pump discharge piping should not be connected directly to any portion of a public storm sewer system. It should be connected to the downspout piping that discharges above grade. It is recommended that overflow retrofit options be explained to owners. These would serve to reduce the chance for basement back‐ups should the existing sump pump outlet become clogged or overwhelmed by high water levels. Examples are shown in Exhibit 5 of Appendix E. No Impact to Wetland Options 1. Modify the storm structure at the northwest corner of the property at 587 Lighthouse Court. An additional window opening would be installed at a lower elevation than the current windows. The elevation of the new opening would be consistent with the elevation of the ditch that has eroded to the structure. This would allow lower frequency rainfall events to enter the underground storm system sooner. See Exhibit 6 in Appendix E. 2. Add a storm inlet structure on the stub pipe located on the property at 571 Lighthouse Court. This would allow lower frequency rainfall events to enter the underground storm system sooner. See Exhibit 7 in Appendix E. 3. Extend the 48” x 76” storm pipe into the Otterbein property and add a catch basin. The structure would be set in the small area that has not been delineated as wetland. The windows of the structure would be the same as the original grate top of the structure at the northwest corner of 587 Lighthouse Court, therefore having NO impact on the normal wetland water elevation. This would require an easement from Otterbein. See Exhibit 8 in Appendix E. Any single one or combination of these items could be installed, or all could be constructed. The above improvements could be performed with no encroachments within the existing delineated wetlands. As such, there would be no regulatory restrictions associated with these improvements. These improvements will not entirely eliminate stormwater ponding on areas of the aforementioned properties, or any other lot in the subdivision, that are within wetlands, easements and/or no build zones. However, they would provide additional inlet capacity for stormwater runoff which could potentially reduce the depth of water on these properties, and possibly Inlet Court, during the more frequent, lower intensity rainfall events. As previously discussed, the existing underground storm sewer system has the capacity to contain up to a 5‐
year storm event. Even with these improvements, rainfall events which exceed the 5‐year design capacity of the underground storm sewer system will continue to accumulate within emht.com | 39 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 wetlands, lots and streets before following overland routing on these properties and throughout the surrounding subdivision, in accordance with the design of the subdivision. Impact to Wetlands Option More significant modifications within the designated wetland preserve areas within the properties at 571 and 587 Lighthouse Court could be performed. Areas of the lots could be filled to get portions of the yards above water elevations that occur during the more frequent, lower intensity rainfall events. Other options include adding inlets and underdrains through the area. However, even with these improvements, large rainfall events that exceed the design capacity of the underground storm sewer system would continue to follow overland routing on these properties and throughout the surrounding subdivision, in accordance with the design of the subdivision. In addition to City acceptance, there are additional regulatory items that would need approval prior to proceeding with this option. This work would constitute violations of the deed restrictions imposed on these lots and, more significantly, would be subject to both federal and state regulatory statutes related to the protection and preservation of wetlands. Prior to this work being performed, permits would need to be applied for and approved by both the U.S. Army Corps of Engineers (USACE) and the Ohio EPA. In addition, the recorded deed restrictions for Section 7 would need to be revised and approved to specifically allow these improvements on these lots. In order to get approval from the USACE, they would be required conduct a field review of the entire subdivision. This would include an assessment of the existing conditions and would document any existing encroachments or development inconsistent with the previously approved drainage plans and federal permits. This could lead to potential enforcement actions through other areas and sections of the development should they encounter any physical disturbances or field variations from the original permit requirements. 7.2 Comprehensive Watershed Study The water‐level monitoring performed as part of this stormwater investigation has determined, at least for the rainfall events experienced during this time period, that the high water conditions within Sections 1 and 7 of the development site are causal influence. Furthermore, the frequency with which these conditions occur suggests they are more related to the local watershed area associated with the wetland areas adjacent to the site. A technical analysis of this watershed to more definitively determine the volume and peak rate of stormwater runoff under various rainfall events would provide the City with the ability to also consider measures within the upstream watershed area to diminish those flows. These measures may occur as part of existing or future development in such a way as to reduce high water and overland routing on the properties in Mariners Cove. It is likely not possible, nor is it practical, to pursue a watershed‐based solution that would completely eliminate the perceived high water on these properties. Their location and proximity to the designated wetlands, and the intended drainage emht.com | 40 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 features included in the design of the subdivision, suggest there are portions of these properties prone to flowing and standing water. emht.com | 41 of 41
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX A REGEN
SANDPIPER COURT
SURF COURT
SEAGULL CO
UR
T
BAY DRIVE
NORTH SPRING
R
OAD
MAXTOWN ROAD
SAILING COURT
W
CO
UR
T
AK
E
DR
IV
SE
AS
ID
E
E
IS
LE
DR
IV
E
N
MARINERS COVE
SECTION 6
C. 2, S. 8, 8A & 8B
SP
RI
NG
RU
RESERVE "B"
587
OTTERBEIN COLLEGE
D.B. 229, P. 439
586
297
571
50
100
200
1 inch =100 feet
LIGHTHOUSE COU
RT
MARINERS COVE
SECTION 7
C. 1, S. 298-298A
64
299
63
990
984
1000
67
1016
1030
62
987
301
66
INLET COURT
300
578
65
BAY DRIVE
298
FISHER
MARINERS COVE
SECTION 1
C. 1, S. 220-226
568
52
970
LEGEND
NO BUILD ZONE "B"
WETLAND PRESERVE 8.2 Ac.
SUNBURY LAKE
DRIVE
EGRET COURT
NO BUILD ZONE "A"
CONTAINS PORTIONS OF
WETLAND AREAS
SEA SHELL DRIVE
CITY OF WESTERVILLE, FRANKLIN COUNTY, OHIO
FOR
RESERVE "B" WETLAND AREA
DELINEATED WETLAND
May, 2013
EGRET COURT
EXISTING STORM SEWER
1" = 100'
2012-0976
SOURCE:
Imagery - 2010
OTTERBEIN COLLEGE
D.B. 229, P. 439
MARINERS COVE
SECTION 6
C. 2, S. 8, 8A & 8B
RESERVE "B"
12"
298
587
299
990
21"
586
63
65
66
984
1000
67
1016
BAY DRIVE
42"
64
1030
21"
MARINERS COVE
SECTION 7
C. 1, S. 298-298A
INLET COURT
300
578
62
987
LIGHTHOUSE COUR
T
MARINERS COVE
SECTION 1
C. 1, S. 220-226
297
571
48" x 76"
301
No Build Zone "A"
568
"x
48
"
76
52
No Build Zone "A"
970
60"
60"
EGRET COURT
SUNBURY LAKE
DRIVE
LEGEND
NO BUILD ZONE "A"
CONTAINS PORTIONS OF
WETLAND AREAS
RESERVE "B" WETLAND AREA
NO BUILD ZONE "B"
EXISTING STORM SEWER
WETLAND PRESERVE 8.2 Ac.
CITY OF WESTERVILLE, FRANKLIN COUNTY, OHIO
FOR
No Build Zone "A"
Ex. Storm Inlet Modified by City
May, 2013
15
SOURCE:
Imagery - 2010
30
Ex. Storm Manhole; solid lid replaced
with grated lid by City
1 inch =30 feet
60
1" = 30'
2012-0976
500
1,00 0
DR
N
RU
IN
G
SP
R
WE NSL EY CT
c
EY
CT
FOX RUN DR
DR
REG E
NCY
c
Approx. 82% of Spring
Run Watershed
passes through the
Maxtown
Culvert
CHATEAURoad
LN
SUNBURY RD
LN
K DR
BAY DR
IS
LE
INLET CT
SUNBURY L AK
Fe et
2,00 0
STORMWATER INVE STIGATION
FOR
MARINERS COVE
EXHIBIT 3
WATERS HED BOUNDAR Y MAP
SE A SHE
TIDEW ATER
LA K E P
CT
LAKE DR
NAUTILUS PL
HOOV ERVIE
W DR
BLUE HE RON
LL DR
T
E DR
EG RET CT
TAM I-SUE CT
c
CT
Ru
n
DR
DR
URY RD
SI
DE
CT
SURF CT
SE
A
E
C
¬
«
Watershed Area for Spring Run
= Approx. 2,000 Ac.
BR
EA
K
ER
N SUNB
DR
W
AK
RD
SCALE: 1" = 1000'
ABN
Sp
rin
g
KEY HAM TERRACE
¬
«
c
HIGH TIM BER DR
COLLIE R DR
B
CITY O F W ES TE RVIL LE, DEL AWA RE COUN TY , O HIO
0
OO
SAY BR
N
WAY L
DUNA
MIKAY LA DR
LANDINGS LOOP W
BELLFRE Y DR
CENTERPARK DR
MILL WIND DR
RUN
R
PO TOM AC AVE
T
GRIS
NS D
OLDE ENGLISH
CT
BUR
Tributary Area A = Approx. 110 Ac. BIG ROCK DR
Tributary Area B = Approx. 90 Ac.
LEG ACY
AMY -LU CT
Tributary Area C = Approx. DR
160 Ac.
Total NO
Area
Approx.
360
Ac.
RTHCH=
URCH LN
(Approx. 18% of Spring Run Watershed)
D DR
MAX TOW N RD
PENBROOK ST
GRANITE DR
E R DR
KINGFI SH
CHESTNUT AVE
LITTLE ROCK RD
RD
OLD DO VE R
BELLFREY CT
OLDE MILL DR
WO ODBE ND DR
NORTHFIE LD RD
Summary of Watershed
Tributary Areas
BIRCH ST
J:\20120976\GIS\Layouts\Exhibit_3.mxd
CT
DR
STONEFIELD DR
ELM CT
LD
WE ST DALE AVE
FIE
WINDSTA
R
Study Area
IN
ES T W
ME ADOW GL
EN DR
SPRINGVIE W DR
A
SE
HILLEGAS FARM
DR
DR
HARV
Watershed Tributary
Boundaries
WHITETAIL LN
A
¬
«
CENTER GREE
N
BENDERSO N DR
N SP RING RD
CT
DEE R TRL
AY
W
HILM AR
RIDGE LAKE CT
GARDEN VIE
W DR
OAK S HA
D
DR
AR
E
AT
HI
LM
HG
JEAN CT
RT
NO
OW DR
BROOKS TONE DR
PINE HO LLOW DR
WI LD RO SE
TUSS IC STRE
ET RD
SHE RBROO K DR
Legend
MI LFORD AV
E
PARK BEND DR
FROS T RD
GRASSM ERE DR
MOUNT ROYAL AVE
SC
T
¹
Revised March 11, 2014
1000
67
1016
1030
50
MARINERS COVE
SECTION 1
C. 1, S. 220-226
NS
FISH ER MA
52
970
RIVE
EGRET COURT
SUNBURY LAKE D
OVERLAND FLOW ROUTE FOR
STORMWATER EVENTS GREATER
THAN 5 YEAR DESIGN STORM EVENT
LL
SHE
A
SE
EGRET COURT
DR
2012-0976
1" = 100'
200
1 inch =100 feet
568
LEGEND
100
62
987
301
66
INLET COURT
300
578
65
FOR
984
T
571
LIGHTHOUSE COUR
297
990
CITY OF WESTERVILLE, FRANKLIN COUNTY, OHIO
63
R
MARINERS COVE
SECTION 7
C. 1, S. 298-298A
64
BAY DRIVE
586
SP
299
587
D
298
RI
NG
RESERVE "B"
May, 2013
RU
N
SECTION 6
C. 2, S. 8, 8A & 8B
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX B MARINERS COVE SECTION 1
RECORD PLAT (Cabinet 1, Slides 220-226)
EASEMENTS
Easements are reserved in, over and under areas designated on this plat as “Easement” or “Drainage
Easement” for the construction, operation and maintenance of all public and quasi public utilities above
and beneath the surface of the ground and, where necessary are for the construction, operation and
maintenance of service connections to all adjacent lots and lands and for storm water drainage. Within
those areas designated “Drainage Easement” on this plat, an additional easement is hereby reserved for
the purpose of constructing, operating and maintaining, major storm water drainage swales and or other
storm water drainage facilities. No above grade structures, dams, fences, or other obstructions to the flow
of storm water runoff are permitted within Drainage Easement areas as delineated on this plat unless
approved by the Director of Public Service, City of Westerville, Ohio. Easement areas shown heron
outside of the platted area are within land owned by the undersigned and easements are reserved
therein for the uses and purposes as expressed herein.
NO BUILD ZONES
The areas designated on this plat as “No Build Zone ‘A’” contain portions of federally delineated
wetland areas which prohibits construction of structures of any kind as defined in Chapter 1105 of The
City of Westerville Codified Ordinances, including fences, fill or diversion of water. The areas
designated “No Build Zone ‘B’” on this plat in rear yards are for the purpose of retaining trees in their
natural setting with no buildings and fences permitted, provided that nothing herein shall prohibit the
removal and/or trimming of trees in said No Build Zone “B” areas in connection with the construction,
operation and maintenance of utility lines and utility structures. Both “A” and “B” No Build Zone areas
may hold water during and after infrequent heavy rains. No use shall be permitted that would interfere
with or be damaged by this water retention.
DEED RESTRICTIONS (Vol. 554, Pg. 1)
ARTICLE I – PROTECTIVE COVENANTS AND RESTRICTIONS
4. NO BUILD ZONE
Designated “No Build Zone ‘A’” contains portions of federally delineated wetland areas which prohibit
construction of structures of any kind as defined in Chapter 1105 of The City of Westerville Codified
Ordinances, including fences, fill or diversion of water. The area may be landscaped, grass out, and
maintained as a yard. Designated “No Build Zone ‘B’” areas in rear yards are for the purpose of
retaining trees in their natural setting with no buildings and fences permitted, provided that nothing
herein shall prohibit the removal and/or trimming of trees in said No Build Zone “B” areas in connection
with the construction, operation and maintenance of utility lines and utility structures. Both “A” and “B” No
Build Zone areas may hold water during and after infrequent heavy rains. No use shall be permitted that
would interfere with or be damaged by this water retention
6. EASEMENTS
Easements for installation and maintenance of utilities, drainage facilities and overlot drainage, including
the pond area, are reserved over, under and through all areas designated “easements” as shown on the
recorded plat and other instruments of record. Within the limits of these easements, the grade specified
on the master grading plan must be complied with and no structure, planting or other materials shall be
placed or permitted to remain which may damage or interfere with the installation, operation or
maintenance of utilities, or which may change the direction of flow of drainage channels in the easements
or which may obstruct or retard the flow of water through drainage channels in the easements. In the
event of a dispute as to compliance or non-compliance with the master grading plan for the subdivision
prepared by Evans, Mechwart, Hambleton & Tilton, Inc. the decision of the City of Westerville shall be
final.
Page 1 of 3
16. EXCAVATIONS
The finished grade of any lot or lots or parts thereof shall comply with the finished grading and drainage
plan as set out in the master plan of the subdivision subject to modification by the Westerville Public
Service Director and in no way permit deviation from the requirements of the approved subdivision
grading plan. The approved grading plan is binding on all lots in the subdivision. Erosion and its effects in
respect to lots are not the responsibility of the Grantor.
24. RESERVES
Within reserves on lots numbered 24, 25, 26, 36, 37, 54, 55, 58, 65, and 66, cul-de-sac islands and
landscape entrances, no fill, buildings, or regarding is permitted. These areas shall be kept in the natural
state and no structures shall be erected or maintained thereon. Such reserves shall be open areas
containing only landscaping, entrance features, sanitary lift station, and necessary utilities. Said reserves
are and shall remain as part of the lots of which they are part and will be conveyed with said lots.
Maintenance of the reserves are the responsibility of the Homeowners Association.
MARINERS COVE SECTION 6
RECORD PLAT (Cabinet 2, Slides 8, 8A, 8B)
EASEMENTS
Easements are reserved in, over and under areas designated on this plat as “Easement” or “Drainage
Easement” for the construction, operation and maintenance of all public and quasi public utilities above
and beneath the surface of the ground and, where necessary are for the construction, operation and
maintenance of service connections to all adjacent lots and lands and for storm water drainage. Within
those areas designated “Drainage Easement” on this plat, an additional easement is hereby reserved for
the purpose of constructing, operating and maintaining, major storm water drainage swales and or other
storm water drainage facilities. No above grade structures, dams, fences, or other obstructions to the flow
of storm water runoff are permitted within Drainage Easement areas as delineated on this plat unless
approved by the Director of Public Service, City of Westerville, Ohio.
RESERVE “B”
Reserve “B”, as designated and delineated hereon, shall be owned and maintained by the City of
Westerville, Ohio and shall remain as a “Wetland” area.
DEED RESTRICTIONS (Vol. 631, Pg. 438)
ARTICLE I – PROTECTIVE COVENANTS AND RESTRICTIONS
5. EASEMENTS
Easements for installation and maintenance of utilities, drainage facilities and overlot drainage, including
the pond area, are reserved over, under and through all areas designated “easements” as shown on the
recorded plat and other instruments of record. Within the limits of these easements, the grade specified
on the master grading plan must be complied with and no structure, planting or other materials shall be
placed or permitted to remain which may damage or interfere with the installation, operation or
maintenance of utilities, or which may change the direction of flow of drainage channels in the easements
or which may obstruct or retard the flow of water through drainage channels in the easements. In the
event of a dispute as to compliance or non-compliance with the master grading plan for the subdivision
prepared by Evans, Mechwart, Hambleton & Tilton, Inc. the decision of the City of Westerville shall be
final.
15. EXCAVATIONS
The finished grade of any lot or lots or parts thereof shall comply with the finished grading and drainage
plan as set out in the master plan of the subdivision subject to modification by the Westerville Public
Service Director and in no way permit deviation from the requirements of the approved subdivision
Page 2 of 3
grading plan. The approved grading plan is binding on all lots in the subdivision. Erosion and its effects in
respect to lots are not the responsibility of the Grantor.
MARINERS COVE SECTION 7
RECORD PLAT (Cabinet 2, Slides 298-298A)
EASEMENTS
Easements are reserved in, over and under areas designated on this plat as “Easement” for the
construction, operation and maintenance of all public and quasi public utilities above and beneath the
surface of the ground and, where necessary are for the construction, operation and maintenance of
service connections to all adjacent lots and lands and for storm water drainage.
WETLANDS
Those portions of Lots 297 and 298 designated hereon as “Wetland”, together with other adjacent lands
outside of Mariners Cove Section 7 were and are currently classified as Waters of the United States by
the U.S. Army Corps of Engineers, Huntington District. As such, certain activities that would have an effect
on said wetlands may require permits from the U.S. Army Corps of Engineers and/or the Ohio
Environmental Protection Agency prior to the conduct of those activities. See Mariners Cove Section 7
deed restrictions for wetland preservation requirements.
DEED RESTRICTIONS (Vol. 16, Pg. 2387)
ARTICLE I – PROTECTIVE COVENANTS AND RESTRICTIONS
5. EASEMENTS
Easements for installation and maintenance of utilities, drainage facilities and overlot drainage, including
the pond area, are reserved over, under and through all areas designated “easements” as shown on the
recorded plat and other instruments of record. Within the limits of these easements, the grade specified
on the master grading plan must be complied with and no structure, planting or other materials shall be
placed or permitted to remain which may damage or interfere with the installation, operation or
maintenance of utilities, or which may change the direction of flow of drainage channels in the easements
or which may obstruct or retard the flow of water through drainage channels in the easements. In the
event of a dispute as to compliance or non-compliance with the master grading plan for the subdivision
prepared by Evans, Mechwart, Hambleton & Tilton, Inc. the decision of the City of Westerville shall be
final.
15. EXCAVATIONS
The finished grade of any lot or lots or parts thereof shall comply with the finished grading and drainage
plan as set out in the master plan of the subdivision subject to modification by the Westerville Public
Service Director and in no way permit deviation from the requirements of the approved subdivision
grading plan. The approved grading plan is binding on all lots in the subdivision. Erosion and its effects in
respect to lots are not the responsibility of the Grantor.
23. WETLAND PRESERVATION
Lot numbers 297 and 298 of Mariners Cove Section 7 contain Federal Jurisdictional Wetlands as shown
on the recorded plat for this section. These areas are to be maintained as wetlands by the owners of said
lots. Any buildings, sheds, slabs, recreation equipment, paving, dirt fills, grading, or other structures or
activities which alter these wetlands areas from their natural state are prohibited. These areas are to be
kept in a natural state of vegetation with wetland plants and grasses and are not to be fine graded,
mowed or maintained as lawn areas.
Page 3 of 3
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX C BACKGROUND
When the Westerville Planning Commission
and City Council approved the Mariner’s Cove
development in the early 1990s, they required
that the developer preserve wetland areas,
and protect streams and the established
woodland areas. These protective measures,
along with the following means, help to
convey stormwater through the development:
• Detention basins and watercourse
easements
• No-build zones
• Rights of way to restrict, convey and direct
stormwater via:
• underground storm sewers
• above ground surface routing through side
Mariner’s Cove
Stormwater Management Information
If you have questions or would like more information,
please contact the City of Westerville Engineering
Division at 614.901.6650.
and rear yards and public streets
LEGEND
Bodies of Water
Wetlands
No Build Area. Has a
potential for standing
water during and after
heavy rains.
No Build Area.
Drainage Easements
Trunk Storm Sewer
Storm Sewer System
WETLANDS THAT PROTECT
MARINER’S COVE
A wetland is an area of land where the ground
is saturated and standing water may be present
on a seasonal or permanent basis. Wetlands
naturally filter runoff, recharge the aquifer,
and act like giant sponges, slowing the flow
of surface water and reducing the impact of
potential stormwater flooding. Mariner’s Cove
includes a substantial wetland preserve and
other designated wetland areas that were
incorporated into the development of the
subdivision. In order to ensure their continued
value as a flood-control mechanism, residents
should be vigilant in protecting wetlands. In
addition, the Mariner’s Cove subdivision is a
part of the Spring Run Watershed. Stormwater
from northwest of the subdivision naturally runs
through yard areas such as those on Seagull
Court and Surf Court into the wetlands within
Mariner’s Cove. Preservation of the watershed
function is vital to water quality throughout the
region.
FREQUENTLY ASKED QUESTIONS
Q. How much rain can my area handle?
A. The Mariner’s Cove neighborhood stormwater
management system has been designed to
accommodate the 10-year storm event. That means
that for any rain event there’s a 10% chance the
system, and consequently, the restricted area in
your yard will flood. This probability may increase if
the ground is frozen (like during the winter of 20102011) and/or the rain events occur closely together
(as occurred in July 2011).
Q. What if an emergency vehicle needs to get
down my street when it is flooded?
Designated streets in the subdivision are designed to
handle standing water during certain rain events. The
elevation of this water will never be too high for an
emergency vehicle to navigate safely.
FREQUENTLY ASKED QUESTIONS
Q. Why do we need to protect the wetlands?
A. When the subdivision was being developed, the US
Army Corps of Engineers and the Ohio Environmental
Protection Agency issued a permit that required the
preservation of identified wetland areas. Wetlands
are critical to managing flood waters, while providing
natural water cleansing properties. Without wetlands
in Mariner’s Cove, overland runoff that is seen along
the perimeter yards and within the street would occur
more frequently.
Q. How do I protect a wetland on or near my
property?
A. The permit issued by the US Army Corps of
Engineers requires there to be no disturbance
of the wetland areas, except for the occasional
maintenance activity such as removing obstacles
that may be causing drainage issues. When
protecting a wetland, it is often what you don’t do
that is important:
• Do not mow or apply chemicals within the
designated wetland area. This plant life helps
protect the water that drains to the wetland area.
• Do not place fill dirt, lawn clippings, wood chips
or other yard waste into the wetland. The natural
flow of water is critical to the wetland’s ability to
manage flood waters.
• Avoid the wetland during recreational activities
that include off-road vehicles, which can damage
the chemical balance and disrupt wildlife.
• Do not construct structures (i.e. sheds, patios,
play equipment, etc.) or store materials within the
wetland area.
FREQUENTLY ASKED QUESTIONS
Q. How do I know what portions of my property are
affected?
A. Easements on the Mariner’s Cove subdivision
plats provide information that certain areas on some
of the lots were to be used to convey stormwater
runoff. The recorded deed restrictions further
describe activities that are forbidden within the
easements. For information about deed restrictions
on your lot, you should visit
http://www.marinerscovewesterville.com/hoa/
Q. Why does my sump pump continue to run, even
during periods of minimal or no rain?
A. The subdivision is located within an area that has
a high water table elevation. This condition is based
on the type of underlying soils and other naturally
occurring conditions within the overall area. The
high ground water elevation can present a continued
source of water along the perimeter of basement
structures, which can result in a more continuous
cycling of your sump pump.
Q. What does the City do to make sure this
stormwater management system is working?
A. The Westerville Service Department routinely
inspects the Mariner’s Cove stormwater system to
make sure that it is free of debris and blockages. The
City’s wetland consultant is also utilized to insure that
the original objectives of preserving the wetlands and
natural areas are being met.
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX D Water Elevation (ft)
890.0
Rainfall
(1) Spring Run
887.0
884.0
3/8/2012 6:00
(2) Catch Basin 1016 Inlet Ct.
3/8/2012 8:24
3/8/2012 10:48
3/8/2012 13:12
3/8/2012 15:36
Date/Time
3/8/2012 18:00
3/8/2012 20:24
0.02
(3) Wetland 1016 Inlet Ct.
0.025
886.0
0.03
885.0
0.035
0.04
3/8/2012 22:48
Rainfall (in)
3/8/2012 6:00
3/8/2012 6:20
3/8/2012 6:47
3/8/2012 7:10
3/8/2012 7:32
3/8/2012 8:00
3/8/2012 8:20
3/8/2012 8:47
3/8/2012 9:10
3/8/2012 9:32
3/8/2012 10:00
3/8/2012 10:20
3/8/2012 10:47
3/8/2012 11:10
3/8/2012 11:32
3/8/2012 12:00
3/8/2012 12:20
3/8/2012 12:47
3/8/2012 13:10
3/8/2012 13:32
3/8/2012 14:00
3/8/2012 14:20
3/8/2012 14:47
3/8/2012 15:10
3/8/2012 15:32
3/8/2012 16:00
3/8/2012 16:20
3/8/2012 16:47
3/8/2012 17:10
3/8/2012 17:32
3/8/2012 18:00
3/8/2012 18:20
3/8/2012 18:47
3/8/2012 19:10
3/8/2012 19:32
3/8/2012 20:00
3/8/2012 20:20
3/8/2012 20:47
3/8/2012 21:10
3/8/2012 21:32
3/8/2012 22:00
March 8, 2012 Storm (0.33")
0
0.005
889.0
0.01
888.0
0.015
May 2, 2012 Storm (1.70" estimated)
891.0
890.0
Water Elevation (ft)
889.0
(1) Spring Run
888.0
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
887.0
886.0
885.0
884.0
5/2/2012 0:00
5/2/2012 2:24
5/2/2012 4:48
5/2/2012 7:12
5/2/2012 9:36
Date/Time
5/2/2012 12:00 5/2/2012 14:24 5/2/2012 16:48
June 1, 2012 Storm (0.78" estimated)
890.0
889.0
Water Elevation (ft)
888.0
(1) Spring Run
(2) Catch Basin 1016 Inlet Ct.
887.0
(3) Wetland 1016 Inlet Ct.
886.0
885.0
884.0
5/31/2012 14:24 5/31/2012 19:12 6/1/2012 0:00
6/1/2012 4:48
6/1/2012 9:36
Date/Time
6/1/2012 14:24 6/1/2012 19:12
6/2/2012 0:00
June 29, 2012 Storm (1.1" estimated)
890.0
889.0
Water Elevation (ft)
888.0
(1) Spring Run
887.0
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
886.0
885.0
884.0
6/29/2012 15:36 6/29/2012 16:48 6/29/2012 18:00 6/29/2012 19:12 6/29/2012 20:24 6/29/2012 21:36 6/29/2012 22:48 6/30/2012 0:00 6/30/2012 1:12
Date/Time
Water Elevation (ft)
890.0
889.0
888.0
(2) Catch Basin Inlet Ct.
887.0
885.0
884.0
7/26/2012 15:07
7/26/2012 17:31
7/26/2012 19:55
7/26/2012 22:19
Date/Time
7/27/2012 0:43
7/27/2012 3:07
0.15
(3) Wetland 1016 Inlet Ct.
0.20
886.0
0.25
0.30
0.35
7/27/2012 5:31
Rainfall (in)
7/26/2012 15:00
7/26/2012 15:20
7/26/2012 15:40
7/26/2012 16:00
7/26/2012 16:20
7/26/2012 16:40
7/26/2012 17:00
7/26/2012 17:20
7/26/2012 17:40
7/26/2012 18:00
7/26/2012 18:20
7/26/2012 18:40
7/26/2012 19:00
7/26/2012 19:20
7/26/2012 19:40
7/26/2012 20:00
7/26/2012 20:20
7/26/2012 20:40
7/26/2012 21:00
7/26/2012 21:20
7/26/2012 21:40
7/26/2012 22:00
7/26/2012 22:20
7/26/2012 22:40
7/26/2012 23:00
7/26/2012 23:20
7/26/2012 23:40
7/27/2012 0:00
7/27/2012 0:20
7/27/2012 0:40
7/27/2012 1:00
7/27/2012 1:20
7/27/2012 1:40
7/27/2012 2:00
7/27/2012 2:20
7/27/2012 2:40
7/27/2012 3:00
7/27/2012 3:20
7/27/2012 3:40
7/27/2012 4:00
July 26, 2012 Storm (1.15")
0.00
0.05
0.10
Rainfall
(1) Spring Run
Water Elevation (ft)
884.0
9/2/2012 3:00
9/2/2012 7:48
9/2/2012 12:36
Date/Time
9/2/2012 17:24
888.0
887.0
9/2/2012 22:12
9/3/2012 3:00
Rainfall
(1) Spring Run
0.30
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
0.40
886.0
885.0
0.50
0.60
9/3/2012 7:48
Rainfall (in)
892.0
9/3/2012 3:00
9/3/2012 2:20
9/3/2012 1:40
9/3/2012 1:00
9/3/2012 0:20
9/2/2012 23:40
9/2/2012 23:00
9/2/2012 22:20
9/2/2012 21:40
9/2/2012 21:00
9/2/2012 20:20
9/2/2012 19:40
9/2/2012 19:00
9/2/2012 18:20
9/2/2012 17:40
9/2/2012 17:00
9/2/2012 16:20
9/2/2012 15:40
9/2/2012 15:00
9/2/2012 14:20
9/2/2012 13:40
9/2/2012 13:00
9/2/2012 12:20
9/2/2012 11:40
9/2/2012 11:00
9/2/2012 10:20
9/2/2012 9:40
9/2/2012 9:00
9/2/2012 8:20
9/2/2012 7:40
9/2/2012 7:00
9/2/2012 6:20
9/2/2012 5:40
9/2/2012 5:00
9/2/2012 4:20
9/2/2012 3:40
9/2/2012 3:00
September 2, 2012 Storm (2.47")
0.00
891.0
0.10
890.0
0.20
889.0
Water Elevation (ft)
884.0
9/8/2012 0:57
9/8/2012 5:45
9/8/2012 10:33
Date/Time
9/8/2012 15:21
887.0
9/8/2012 20:09
9/9/2012 0:57
(3) Wetland 1016 Inlet Ct.
890.0
Rainfall
(1) Spring Run
0.05
(2) Catch Basin 1016 Inlet Ct.
0.06
886.0
0.07
885.0
0.08
0.09
0.1
9/9/2012 5:45
Rainfall (in)
9/8/2012 23:40
9/8/2012 23:00
9/8/2012 22:20
9/8/2012 21:40
9/8/2012 21:00
9/8/2012 20:20
9/8/2012 19:40
9/8/2012 19:00
9/8/2012 18:20
9/8/2012 17:40
9/8/2012 17:00
9/8/2012 16:20
9/8/2012 15:40
9/8/2012 15:00
9/8/2012 14:20
9/8/2012 13:40
9/8/2012 13:00
9/8/2012 12:20
9/8/2012 11:40
9/8/2012 11:00
9/8/2012 10:20
9/8/2012 9:40
9/8/2012 9:00
9/8/2012 8:20
9/8/2012 7:40
9/8/2012 7:00
9/8/2012 6:20
9/8/2012 5:40
9/8/2012 5:00
9/8/2012 4:20
9/8/2012 3:40
9/8/2012 3:00
9/8/2012 2:20
9/8/2012 1:40
9/8/2012 1:00
September 8, 2012 Storm (0.66")
0
0.01
889.0
0.02
888.0
0.03
0.04
Water Elevation (ft)
884.0
9/21/2012 22:04
9/22/2012 1:40
893.0
Rainfall
890.0
(3) Wetland 1016 Inlet Ct.
889.0
(5) 571 Lighthouse
0.06
888.0
887.0
9/22/2012 5:16
9/22/2012 8:52
Date/Time
9/22/2012 12:28
9/22/2012 16:04
Rainfall (in)
891.0
9/22/2012 16:00
9/22/2012 15:30
9/22/2012 15:00
9/22/2012 14:30
9/22/2012 14:00
9/22/2012 13:30
9/22/2012 13:00
9/22/2012 12:30
9/22/2012 12:00
9/22/2012 11:30
9/22/2012 11:00
9/22/2012 10:30
9/22/2012 10:00
9/22/2012 9:30
9/22/2012 9:00
9/22/2012 8:30
9/22/2012 8:00
9/22/2012 7:30
9/22/2012 7:00
9/22/2012 6:30
9/22/2012 6:00
9/22/2012 5:30
9/22/2012 5:00
9/22/2012 4:30
9/22/2012 4:00
9/22/2012 3:30
9/22/2012 3:00
9/22/2012 2:30
9/22/2012 2:00
9/22/2012 1:30
9/22/2012 1:00
9/22/2012 0:30
9/22/2012 0:00
9/21/2012 23:30
9/21/2012 23:00
9/21/2012 22:30
9/21/2012 22:00
September 21, 2012 Storm (1.18")
0
892.0
0.02
(1) Spring Run
(2) Catch Basin 1016 Inlet Ct.
0.04
(4) 587 Lighthouse
0.08
886.0
0.1
885.0
0.12
9/22/2012 19:40
Water Elevation (ft)
893.0
892.0
(1) Spring Run
891.0
890.0
884.0
9/26/2012 22:04
(4) 587 Lighthouse
889.0
0.06
888.0
887.0
9/27/2012 2:52
9/27/2012 7:40
9/27/2012 12:28
Date/Time
9/27/2012 17:16
9/27/2012 22:04
Rainfall (in)
9/26/2012 22:00
9/26/2012 22:40
9/26/2012 23:20
9/27/2012 0:00
9/27/2012 0:40
9/27/2012 1:20
9/27/2012 2:00
9/27/2012 2:40
9/27/2012 3:20
9/27/2012 4:00
9/27/2012 4:40
9/27/2012 5:20
9/27/2012 6:00
9/27/2012 6:40
9/27/2012 7:20
9/27/2012 8:00
9/27/2012 8:40
9/27/2012 9:20
9/27/2012 10:00
9/27/2012 10:40
9/27/2012 11:20
9/27/2012 12:00
9/27/2012 12:40
9/27/2012 13:20
9/27/2012 14:00
9/27/2012 14:40
9/27/2012 15:20
9/27/2012 16:00
9/27/2012 16:40
9/27/2012 17:20
9/27/2012 18:00
9/27/2012 18:40
9/27/2012 19:20
9/27/2012 20:00
9/27/2012 20:40
9/27/2012 21:20
9/27/2012 22:00
9/27/2012 22:40
9/27/2012 23:20
9/28/2012 0:00
September 26-27, 2012 Storm (0.72")
0
Rainfall
0.02
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
0.04
(5) 571 Lighthouse
0.08
886.0
0.1
885.0
0.12
9/28/2012 2:52
Water Elevation (ft)
893.0
0.00
892.0
0.02
891.0
884.0
10/2/2012 18:57
(1) Spring Run
890.0
(3) Wetland 1016 Inlet Ct.
889.0
(5) 571 Lighthouse
10/2/2012 21:21
10/2/2012 23:45
10/3/2012 2:09
10/3/2012 4:33
Date/Time
10/3/2012 6:57
0.08
888.0
0.10
887.0
0.12
886.0
0.14
885.0
0.16
10/3/2012 9:21
Rainfall (in)
10/2/2012 19:00
10/2/2012 19:20
10/2/2012 19:40
10/2/2012 20:00
10/2/2012 20:20
10/2/2012 20:40
10/2/2012 21:00
10/2/2012 21:20
10/2/2012 21:40
10/2/2012 22:00
10/2/2012 22:20
10/2/2012 22:40
10/2/2012 23:00
10/2/2012 23:20
10/2/2012 23:40
10/3/2012 0:00
10/3/2012 0:20
10/3/2012 0:40
10/3/2012 1:00
10/3/2012 1:20
10/3/2012 1:40
10/3/2012 2:00
10/3/2012 2:20
10/3/2012 2:40
10/3/2012 3:00
10/3/2012 3:20
10/3/2012 3:40
10/3/2012 4:00
10/3/2012 4:20
10/3/2012 4:40
10/3/2012 5:00
10/3/2012 5:20
10/3/2012 5:40
10/3/2012 6:00
10/3/2012 6:20
10/3/2012 6:40
10/3/2012 7:00
10/3/2012 7:20
10/3/2012 7:40
10/3/2012 8:00
10/3/2012 8:20
10/3/2012 8:40
10/3/2012 9:00
10/3/2012 9:20
10/3/2012 9:40
October 2, 2012 Storm (0.40")
Rainfall
0.04
(2) Catch Basin 1016 Inlet Ct.
0.06
(4) 587 Lighthouse
0.18
10/3/2012 11:45
Water Elevation (ft)
893.0
892.0
891.0
(2) Catch Basin 1016 Inlet Ct.
890.0
(4) 587 Lighthouse
889.0
884.0
10/5/2012 20:52
(5) 571 Lighthouse
0.04
888.0
0.05
887.0
886.0
0.06
885.0
0.07
10/6/2012 0:00
10/6/2012 3:07
10/6/2012 6:14
Date/Time
10/6/2012 9:21
10/6/2012 12:28
10/6/2012 15:36
0.08
Rainfall (in)
10/5/2012 21:00
10/5/2012 21:30
10/5/2012 22:00
10/5/2012 22:30
10/5/2012 23:00
10/5/2012 23:30
10/6/2012 0:00
10/6/2012 0:30
10/6/2012 1:00
10/6/2012 1:30
10/6/2012 2:00
10/6/2012 2:30
10/6/2012 3:00
10/6/2012 3:30
10/6/2012 4:00
10/6/2012 4:30
10/6/2012 5:00
10/6/2012 5:30
10/6/2012 6:00
10/6/2012 6:30
10/6/2012 7:00
10/6/2012 7:30
10/6/2012 8:00
10/6/2012 8:30
10/6/2012 9:00
10/6/2012 9:30
10/6/2012 10:00
10/6/2012 10:30
10/6/2012 11:00
10/6/2012 11:30
10/6/2012 12:00
10/6/2012 12:30
10/6/2012 13:00
10/6/2012 13:30
10/6/2012 14:00
10/6/2012 14:30
10/6/2012 15:00
10/6/2012 15:30
10/6/2012 16:00
10/6/2012 16:30
10/6/2012 17:00
October 5, 2012 Storm (0.51")
0.00
Rainfall
0.01
(1) Spring Run
0.02
(3) Wetland 1016 Inlet Ct.
0.03
Water Elevation (ft)
893.0
891.0
889.0
884.0
10/28/2012 14:52
Rainfall
(1) Spring Run
888.0
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
887.0
886.0
10/29/2012 2:52
10/29/2012 14:52
10/30/2012 2:52
Date/Time
10/30/2012 14:52
10/31/2012 2:52
0.02
(4) 587 Lighthouse
(5) 571 Lighthouse
0.02
885.0
0.03
10/31/2012 14:52
Rainfall (in)
10/28/2012 15:00
10/28/2012 16:40
10/28/2012 18:20
10/28/2012 20:00
10/28/2012 21:40
10/28/2012 23:20
10/29/2012 1:00
10/29/2012 2:40
10/29/2012 4:20
10/29/2012 6:00
10/29/2012 7:40
10/29/2012 9:20
10/29/2012 11:00
10/29/2012 12:40
10/29/2012 14:20
10/29/2012 16:00
10/29/2012 17:40
10/29/2012 19:20
10/29/2012 21:00
10/29/2012 22:40
10/30/2012 0:20
10/30/2012 2:00
10/30/2012 3:40
10/30/2012 5:20
10/30/2012 7:00
10/30/2012 8:40
10/30/2012 10:20
10/30/2012 12:00
10/30/2012 13:40
10/30/2012 15:20
10/30/2012 17:00
10/30/2012 18:40
10/30/2012 20:20
10/30/2012 22:00
10/30/2012 23:40
10/31/2012 1:20
10/31/2012 3:00
10/31/2012 4:40
10/31/2012 6:20
10/31/2012 8:00
10/31/2012 9:40
10/31/2012 11:20
10/31/2012 13:00
10/31/2012 14:40
10/31/2012 16:20
10/31/2012 18:00
October 28-29, 2012 Storm (0.73")
0.00
892.0
0.01
890.0
0.01
Water Elevation (ft)
884.0
11/12/2012 6:57
11/12/2012 11:45
11/12/2012 16:33
Date/Time
889.0
888.0
887.0
11/12/2012 21:21
886.0
885.0
11/13/2012 2:09
(4) 587 Lighthouse
(3) Wetland 1016 Inlet Ct.
893.0
0.00
892.0
0.01
Rainfall
(1) Spring Run
0.05
(2) Catch Basin 1016 Inlet Ct.
0.06
(5) 571 Lighthouse
0.07
0.08
0.09
0.10
11/13/2012 6:57
Rainfall (in)
891.0
11/13/2012 7:00
11/13/2012 6:20
11/13/2012 5:40
11/13/2012 5:00
11/13/2012 4:20
11/13/2012 3:40
11/13/2012 3:00
11/13/2012 2:20
11/13/2012 1:40
11/13/2012 1:00
11/13/2012 0:20
11/12/2012 23:40
11/12/2012 23:00
11/12/2012 22:20
11/12/2012 21:40
11/12/2012 21:00
11/12/2012 20:20
11/12/2012 19:40
11/12/2012 19:00
11/12/2012 18:20
11/12/2012 17:40
11/12/2012 17:00
11/12/2012 16:20
11/12/2012 15:40
11/12/2012 15:00
11/12/2012 14:20
11/12/2012 13:40
11/12/2012 13:00
11/12/2012 12:20
11/12/2012 11:40
11/12/2012 11:00
11/12/2012 10:20
11/12/2012 9:40
11/12/2012 9:00
11/12/2012 8:20
11/12/2012 7:40
11/12/2012 7:00
November 12, 2012 Storm (0.64")
0.02
890.0
0.03
0.04
Water Elevation (ft)
884.0
12/4/2012 14:52
12/4/2012 17:16
12/4/2012 19:40
12/4/2012 22:04
Date/Time
889.0
888.0
887.0
12/5/2012 0:28
12/5/2012 2:52
(3) Wetland 1016 Inlet Ct.
(5) 571 Lighthouse
885.0
12/5/2012 5:16
(1) Spring Run
893.0
0.00
892.0
0.01
Rainfall
0.04
(2) Catch Basin 1016 Inlet Ct.
0.05
(4) 587 Lighthouse
886.0
0.06
0.07
0.08
Rainfall (in)
12/5/2012 7:00
12/5/2012 6:30
12/5/2012 6:00
12/5/2012 5:30
12/5/2012 5:00
12/5/2012 4:30
12/5/2012 4:00
12/5/2012 3:30
12/5/2012 3:00
12/5/2012 2:30
12/5/2012 2:00
12/5/2012 1:30
12/5/2012 1:00
12/5/2012 0:30
12/5/2012 0:00
12/4/2012 23:30
12/4/2012 23:00
12/4/2012 22:30
12/4/2012 22:00
12/4/2012 21:30
12/4/2012 21:00
12/4/2012 20:30
12/4/2012 20:00
12/4/2012 19:30
12/4/2012 19:00
12/4/2012 18:30
12/4/2012 18:00
12/4/2012 17:30
12/4/2012 17:00
12/4/2012 16:30
12/4/2012 16:00
12/4/2012 15:30
12/4/2012 15:00
December 4, 2012 Storm (0.72")
891.0
0.02
890.0
0.03
Water Elevation (ft)
893.0
0.00
892.0
0.01
891.0
0.01
890.0
0.02
889.0
884.0
12/7/2012 0:57
Rainfall
888.0
(2) Catch Basin 1016 Inlet Ct.
887.0
(4) 587 Lighthouse
12/7/2012 6:57
12/7/2012 12:57
12/7/2012 18:57
12/8/2012 0:57
Date/Time
12/8/2012 6:57
12/8/2012 12:57
0.02
(1) Spring Run
0.03
(3) Wetland 1016 Inlet Ct.
0.03
(5) 571 Lighthouse
886.0
0.04
885.0
0.04
0.05
Rainfall (in)
12/7/2012 1:00
12/7/2012 2:00
12/7/2012 3:00
12/7/2012 4:00
12/7/2012 5:00
12/7/2012 6:00
12/7/2012 7:00
12/7/2012 8:00
12/7/2012 9:00
12/7/2012 10:00
12/7/2012 11:00
12/7/2012 12:00
12/7/2012 13:00
12/7/2012 14:00
12/7/2012 15:00
12/7/2012 16:00
12/7/2012 17:00
12/7/2012 18:00
12/7/2012 19:00
12/7/2012 20:00
12/7/2012 21:00
12/7/2012 22:00
12/7/2012 23:00
12/8/2012 0:00
12/8/2012 1:00
12/8/2012 2:00
12/8/2012 3:00
12/8/2012 4:00
12/8/2012 5:00
12/8/2012 6:00
12/8/2012 7:00
12/8/2012 8:00
12/8/2012 9:00
12/8/2012 10:00
12/8/2012 11:00
12/8/2012 12:00
12/8/2012 13:00
12/8/2012 14:00
12/8/2012 15:00
12/8/2012 16:00
12/8/2012 17:00
12/8/2012 18:00
12/8/2012 19:00
December 7, 2012 Storm (0.95")
Water Elevation (ft)
884.0
12/20/2012 10:04 12/20/2012 13:40 12/20/2012 17:16 12/20/2012 20:52
Date/Time
890.0
889.0
888.0
887.0
12/21/2012 0:28
12/21/2012 4:04
886.0
885.0
12/21/2012 7:40
894.0
0.00
893.0
0.01
892.0
Rainfall
(2) Catch Basin 1016 Inlet Ct.
(4) 571 Lighthouse Rear Yard
0.04
(1) Spring Run
0.05
(3) Wetland 1016 Inlet Ct.
0.06
(5) 571 Lighthouse Catch Basin
0.07
0.08
0.09
Rainfall (in)
12/21/2012 10:40
12/21/2012 10:00
12/21/2012 9:20
12/21/2012 8:40
12/21/2012 8:00
12/21/2012 7:20
12/21/2012 6:40
12/21/2012 6:00
12/21/2012 5:20
12/21/2012 4:40
12/21/2012 4:00
12/21/2012 3:20
12/21/2012 2:40
12/21/2012 2:00
12/21/2012 1:20
12/21/2012 0:40
12/21/2012 0:00
12/20/2012 23:20
12/20/2012 22:40
12/20/2012 22:00
12/20/2012 21:20
12/20/2012 20:40
12/20/2012 20:00
12/20/2012 19:20
12/20/2012 18:40
12/20/2012 18:00
12/20/2012 17:20
12/20/2012 16:40
12/20/2012 16:00
12/20/2012 15:20
12/20/2012 14:40
12/20/2012 14:00
12/20/2012 13:20
12/20/2012 12:40
12/20/2012 12:00
12/20/2012 11:20
12/20/2012 10:40
12/20/2012 10:00
December 20, 2012 Storm (0.92")
0.02
891.0
0.03
Water Elevation (ft)
894.0
0.00
893.0
0.10
892.0
0.20
891.0
0.30
890.0
0.40
889.0
Rainfall
884.0
1/11/2013 7:55
(1) Spring Run
888.0
887.0
1/11/2013 11:31
1/11/2013 15:07
1/11/2013 18:43
1/11/2013 22:19
Date/Time
1/12/2013 1:55
1/12/2013 5:31
0.50
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
(4) 571 Lighthouse Rear Yard
0.60
(5) 571 Lighthouse Catch Basin
0.70
886.0
0.80
885.0
0.90
1.00
1/12/2013 9:07
Rainfall (in)
1/11/2013 8:00
1/11/2013 8:40
1/11/2013 9:20
1/11/2013 10:00
1/11/2013 10:40
1/11/2013 11:20
1/11/2013 12:00
1/11/2013 12:40
1/11/2013 13:20
1/11/2013 14:00
1/11/2013 14:40
1/11/2013 15:20
1/11/2013 16:00
1/11/2013 16:40
1/11/2013 17:20
1/11/2013 18:00
1/11/2013 18:40
1/11/2013 19:20
1/11/2013 20:00
1/11/2013 20:40
1/11/2013 21:20
1/11/2013 22:00
1/11/2013 22:40
1/11/2013 23:20
1/12/2013 0:00
1/12/2013 0:40
1/12/2013 1:20
1/12/2013 2:00
1/12/2013 2:40
1/12/2013 3:20
1/12/2013 4:00
1/12/2013 4:40
1/12/2013 5:20
1/12/2013 6:00
1/12/2013 6:40
1/12/2013 7:20
1/12/2013 8:00
1/12/2013 8:40
1/12/2013 9:20
1/12/2013 10:00
January 12, 2013 Snow melt
Water Elevation (ft)
894.0
893.0
890.0
889.0
Rainfall
884.0
3/18/2013 2:52
(1) Spring Run
888.0
887.0
885.0
3/18/2013 6:28
3/18/2013 10:04
3/18/2013 13:40
3/18/2013 17:16
Date/Time
3/18/2013 20:52
3/19/2013 0:28
0.04
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
(5) 571 Lighthouse Catch Basin
0.05
(4) 571 Lighthouse Rear Yard
0.06
886.0
0.07
0.08
3/19/2013 4:04
Rainfall (in)
3/18/2013 3:00
3/18/2013 3:40
3/18/2013 4:20
3/18/2013 5:00
3/18/2013 5:40
3/18/2013 6:20
3/18/2013 7:00
3/18/2013 7:40
3/18/2013 8:20
3/18/2013 9:00
3/18/2013 9:40
3/18/2013 10:20
3/18/2013 11:00
3/18/2013 11:40
3/18/2013 12:20
3/18/2013 13:00
3/18/2013 13:40
3/18/2013 14:20
3/18/2013 15:00
3/18/2013 15:40
3/18/2013 16:20
3/18/2013 17:00
3/18/2013 17:40
3/18/2013 18:20
3/18/2013 19:00
3/18/2013 19:40
3/18/2013 20:20
3/18/2013 21:00
3/18/2013 21:40
3/18/2013 22:20
3/18/2013 23:00
3/18/2013 23:40
3/19/2013 0:20
3/19/2013 1:00
3/19/2013 1:40
3/19/2013 2:20
3/19/2013 3:00
3/19/2013 3:40
3/19/2013 4:20
3/19/2013 5:00
March 18, 2013 Storm (0.65")
0.00
0.01
892.0
0.02
891.0
0.03
Water Elevation (ft)
884.0
6/29/2013 17:16
6/29/2013 20:52
6/30/2013 0:28
Date/Time
887.0
886.0
6/30/2013 4:04
6/30/2013 7:40
Rainfall
(1) Spring Run
0.25
(2) Catch Basin 1016 Inlet Ct.
0.30
(3) Wetland 1016 Inlet Ct.
0.35
885.0
0.40
0.45
0.50
6/30/2013 11:16
Rainfall (in)
890.0
6/30/2013 12:00
6/30/2013 11:30
6/30/2013 11:00
6/30/2013 10:00
6/30/2013 10:30
6/30/2013 9:30
6/30/2013 9:00
6/30/2013 8:00
6/30/2013 8:30
6/30/2013 7:30
6/30/2013 7:00
6/30/2013 6:00
6/30/2013 6:30
6/30/2013 5:30
6/30/2013 5:00
6/30/2013 4:30
6/30/2013 3:30
6/30/2013 4:00
6/30/2013 3:00
6/30/2013 2:30
6/30/2013 1:30
6/30/2013 2:00
6/30/2013 1:00
6/30/2013 0:30
6/29/2013 23:30
6/30/2013 0:00
6/29/2013 23:00
6/29/2013 22:30
6/29/2013 22:00
6/29/2013 21:00
6/29/2013 21:30
6/29/2013 20:30
6/29/2013 20:00
6/29/2013 19:00
6/29/2013 19:30
6/29/2013 18:30
6/29/2013 18:00
6/29/2013 17:30
6/29/2013 17:00
June 29, 2013 Storm (1.70")
0.00
0.05
889.0
0.10
888.0
0.15
0.20
Water Elevation (ft)
7/8/2013 2:00
7/8/2013 3:30
7/8/2013 5:00
7/8/2013 6:30
7/8/2013 8:00
7/8/2013 9:30
7/8/2013 11:00
7/8/2013 12:30
7/8/2013 14:00
7/8/2013 15:30
7/8/2013 17:00
7/8/2013 18:30
7/8/2013 20:00
7/8/2013 21:30
7/8/2013 23:00
7/9/2013 0:30
7/9/2013 2:00
7/9/2013 3:30
7/9/2013 5:00
7/9/2013 6:30
7/9/2013 8:00
7/9/2013 9:30
7/9/2013 11:00
7/9/2013 12:30
7/9/2013 14:00
7/9/2013 15:30
7/9/2013 17:00
7/9/2013 18:30
7/9/2013 20:00
7/9/2013 21:30
7/9/2013 23:00
7/10/2013 0:30
7/10/2013 2:00
7/10/2013 3:30
7/10/2013 5:00
7/10/2013 6:30
7/10/2013 8:00
7/10/2013 9:30
7/10/2013 11:00
7/10/2013 12:30
7/10/2013 14:00
7/10/2013 15:30
7/10/2013 17:00
July 8-10, 2013 Storm (2.16")
892.0
884.0
7/8/2013 2:24
0.00
891.0
0.05
890.0
0.10
889.0
Rainfall
(1) Spring Run
888.0
7/8/2013 10:48
7/8/2013 19:12
7/9/2013 3:36
7/9/2013 12:00
Date/Time
7/9/2013 20:24
7/10/2013 4:48
0.15
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
885.0
7/10/2013 13:12
0.20
887.0
886.0
0.25
0.30
0.35
Water Elevation (ft)
894.0
Rainfall
892.0
891.0
(3) Wetland 1016 Inlet Ct.
890.0
(5) Lighthouse Catch Basin
889.0
0.60
Date/Time
Rainfall (in)
9/20/2013 22:00
9/20/2013 22:40
9/20/2013 23:20
9/21/2013 0:00
9/21/2013 0:40
9/21/2013 1:20
9/21/2013 2:00
9/21/2013 2:40
9/21/2013 3:20
9/21/2013 4:00
9/21/2013 4:40
9/21/2013 5:20
9/21/2013 6:00
9/21/2013 6:40
9/21/2013 7:20
9/21/2013 8:00
9/21/2013 8:40
9/21/2013 9:20
9/21/2013 10:00
9/21/2013 10:40
9/21/2013 11:20
9/21/2013 12:00
9/21/2013 12:40
9/21/2013 13:20
9/21/2013 14:00
9/21/2013 14:40
9/21/2013 15:20
9/21/2013 16:00
9/21/2013 16:40
9/21/2013 17:20
9/21/2013 18:00
9/21/2013 18:40
9/21/2013 19:20
9/21/2013 20:00
9/21/2013 20:40
9/21/2013 21:20
9/21/2013 22:00
9/21/2013 22:40
9/21/2013 23:20
9/22/2013 0:00
9/22/2013 0:40
9/22/2013 1:20
9/22/2013 2:00
9/22/2013 2:40
September 21, 2013 Storm (2.2")
0.00
893.0
(1) Spring Run
0.20
(2) Catch Basin 1016 Inlet Ct.
(4) 571 Lighthouse Rear Yard
0.40
888.0
887.0
0.80
886.0
1.00
885.0
884.0
1.20
9/20/2013 22:04 9/21/2013 1:40 9/21/2013 5:16 9/21/2013 8:52 9/21/2013 12:28 9/21/2013 16:04 9/21/2013 19:40 9/21/2013 23:16 9/22/2013 2:52
Water Elevation (ft)
894.0
Rainfall
889.0
(1) Spring Run
888.0
887.0
(4) 571 Lighthouse Rear Yard
884.0
10/6/2013 15:0010/6/2013 18:3610/6/2013 22:1210/7/2013 1:48 10/7/2013 5:2410/7/2013 9:0010/7/2013 12:3610/7/2013 16:1210/7/2013 19:48
Date/Time
0.60
(2) Catch Basin 1016 Inlet Ct.
(3) Wetland 1016 Inlet Ct.
0.80
(5) 571 Lighthouse Catch Basin
886.0
1.00
885.0
1.20
Rainfall (in)
10/6/2013 15:00
10/6/2013 15:50
10/6/2013 16:40
10/6/2013 17:30
10/6/2013 18:20
10/6/2013 19:10
10/6/2013 20:00
10/6/2013 20:50
10/6/2013 21:40
10/6/2013 22:30
10/6/2013 23:20
10/7/2013 0:10
10/7/2013 1:00
10/7/2013 1:50
10/7/2013 2:40
10/7/2013 3:30
10/7/2013 4:20
10/7/2013 5:10
10/7/2013 6:00
10/7/2013 6:50
10/7/2013 7:40
10/7/2013 8:30
10/7/2013 9:20
10/7/2013 10:10
10/7/2013 11:00
10/7/2013 11:50
10/7/2013 12:40
10/7/2013 13:30
10/7/2013 14:20
10/7/2013 15:10
10/7/2013 16:00
10/7/2013 16:50
10/7/2013 17:40
10/7/2013 18:30
10/7/2013 19:20
10/7/2013 20:10
10/7/2013 21:00
10/7/2013 21:50
10/7/2013 22:40
October 6, 2013 Storm (3.2")
0.00
893.0
892.0
0.20
891.0
0.40
890.0
Water Elevation (ft)
894.0
0.00
893.0
0.02
892.0
884.0
12/21/2013 4:59
Rainfall
891.0
(2) Catch Basin 1016 Inlet Ct.
890.0
(4) 571 Lighthouse Rear Yard
889.0
(5) 571 Lighthouse Catch Basin
12/21/2013 12:11
12/21/2013 19:23
12/22/2013 2:35
12/22/2013 9:47
Date/Time
12/22/2013 16:59
12/23/2013 0:11
0.10
888.0
0.12
887.0
0.14
886.0
0.16
885.0
0.18
0.20
Rainfall (in)
12/21/2013 5:00
12/21/2013 6:10
12/21/2013 7:20
12/21/2013 8:30
12/21/2013 9:40
12/21/2013 10:50
12/21/2013 12:00
12/21/2013 13:10
12/21/2013 14:20
12/21/2013 15:30
12/21/2013 16:40
12/21/2013 17:50
12/21/2013 19:00
12/21/2013 20:10
12/21/2013 21:20
12/21/2013 22:30
12/21/2013 23:40
12/22/2013 0:50
12/22/2013 2:00
12/22/2013 3:10
12/22/2013 4:20
12/22/2013 5:30
12/22/2013 6:40
12/22/2013 7:50
12/22/2013 9:00
12/22/2013 10:10
12/22/2013 11:20
12/22/2013 12:30
12/22/2013 13:40
12/22/2013 14:50
12/22/2013 16:00
12/22/2013 17:10
12/22/2013 18:20
12/22/2013 19:30
12/22/2013 20:40
12/22/2013 21:50
12/22/2013 23:00
12/23/2013 0:10
12/23/2013 1:20
12/23/2013 2:30
12/23/2013 3:40
12/23/2013 4:50
12/23/2013 6:00
December 21-23, 2013 Storm (1.94")
0.04
(1) Spring Run
0.06
(3) Wetland 1016 Inlet Ct.
0.08
Water Elevation (ft)
894.0
0.00
893.0
0.10
892.0
884.0
2/20/2014 7:00
(1) Spring Run
891.0
(3) 1016 Inlet Ct. Wetland
890.0
(5) 571 Lighthouse Catch Basin
889.0
0.50
888.0
0.60
887.0
0.70
886.0
0.80
885.0
0.90
2/20/2014 13:00 2/20/2014 19:00
2/21/2014 1:00
2/21/2014 7:00
Date/Time
2/21/2014 13:00 2/21/2014 19:00
1.00
2/22/2014 1:00
Rainfall (in)
2/20/2014 7:00
2/20/2014 8:00
2/20/2014 9:00
2/20/2014 10:00
2/20/2014 11:00
2/20/2014 12:00
2/20/2014 13:00
2/20/2014 14:00
2/20/2014 15:00
2/20/2014 16:00
2/20/2014 17:00
2/20/2014 18:00
2/20/2014 19:00
2/20/2014 20:00
2/20/2014 21:00
2/20/2014 22:00
2/20/2014 23:00
2/21/2014 0:00
2/21/2014 1:00
2/21/2014 2:00
2/21/2014 3:00
2/21/2014 4:00
2/21/2014 5:00
2/21/2014 6:00
2/21/2014 7:00
2/21/2014 8:00
2/21/2014 9:00
2/21/2014 10:00
2/21/2014 11:00
2/21/2014 12:00
2/21/2014 13:00
2/21/2014 14:00
2/21/2014 15:00
2/21/2014 16:00
2/21/2014 17:00
2/21/2014 18:00
2/21/2014 19:00
2/21/2014 20:00
2/21/2014 21:00
2/21/2014 22:00
2/21/2014 23:00
2/22/2014 0:00
2/22/2014 1:00
February 20-22, 2014 (snow melt)
Rainfall
0.20
(2) 1016 Inlet Ct. Catch Basin
(4) 571 Lighthouse Rear Yard
0.30
0.40
Water Elevation (ft)
894.0
0.00
893.0
0.01
892.0
884.0
4/3/2014 7:59
(1) Spring Run
891.0
(3) 1016 Inlet Ct. Wetland
890.0
(5) 571 Lighthouse Catch Basin
889.0
0.05
888.0
0.06
887.0
0.07
886.0
0.08
885.0
0.09
4/3/2014 13:59
4/3/2014 19:59
4/4/2014 1:59
4/4/2014 7:59
Date/Time
4/4/2014 13:59
4/4/2014 19:59
0.10
Rainfall (in)
4/3/2014 8:00
4/3/2014 9:00
4/3/2014 10:00
4/3/2014 11:00
4/3/2014 12:00
4/3/2014 13:00
4/3/2014 14:00
4/3/2014 15:00
4/3/2014 16:00
4/3/2014 17:00
4/3/2014 18:00
4/3/2014 19:00
4/3/2014 20:00
4/3/2014 21:00
4/3/2014 22:00
4/3/2014 23:00
4/4/2014 0:00
4/4/2014 1:00
4/4/2014 2:00
4/4/2014 3:00
4/4/2014 4:00
4/4/2014 5:00
4/4/2014 6:00
4/4/2014 7:00
4/4/2014 8:00
4/4/2014 9:00
4/4/2014 10:00
4/4/2014 11:00
4/4/2014 12:00
4/4/2014 13:00
4/4/2014 14:00
4/4/2014 15:00
4/4/2014 16:00
4/4/2014 17:00
4/4/2014 18:00
4/4/2014 19:00
4/4/2014 20:00
4/4/2014 21:00
4/4/2014 22:00
4/4/2014 23:00
4/5/2014 0:00
April 3-4, 2014 (1.23")
Rainfall
0.02
(2) 1016 Inlet Ct. Catch Basin
0.03
(4) 571 Lighthouse Rear Yard
0.04
Water Elevation (ft)
884.0
5/12/2014 1:59
5/12/2014 4:23
5/12/2014 6:47
5/12/2014 9:11
889.0
Rainfall (in)
892.0
891.0
890.0
888.0
886.0
Date/Time
894.0
(1) Spring Run
(5) 571 Lighthouse Catch Basin
5/12/2014 19:00
5/12/2014 18:30
5/12/2014 18:00
5/12/2014 17:30
5/12/2014 17:00
5/12/2014 16:30
5/12/2014 16:00
5/12/2014 15:30
5/12/2014 15:00
5/12/2014 14:30
5/12/2014 14:00
5/12/2014 13:30
5/12/2014 13:00
5/12/2014 12:30
5/12/2014 12:00
5/12/2014 11:30
5/12/2014 11:00
5/12/2014 10:30
5/12/2014 10:00
5/12/2014 9:30
5/12/2014 9:00
5/12/2014 8:30
5/12/2014 8:00
5/12/2014 7:30
5/12/2014 7:00
5/12/2014 6:30
5/12/2014 6:00
5/12/2014 5:30
5/12/2014 5:00
5/12/2014 4:30
5/12/2014 4:00
5/12/2014 3:30
5/12/2014 3:00
5/12/2014 2:30
5/12/2014 2:00
May 12, 2014 (1.07")
0.00
893.0
Rainfall
0.05
(2) 1016 Inlet Ct. Catch Basin
(3) 1016 Inlet Ct. Wetland
(4) 571 Lighthouse Rear Yard
0.10
0.15
887.0
0.20
885.0
0.25
5/12/2014 11:35 5/12/2014 13:59 5/12/2014 16:23 5/12/2014 18:47
Water Elevation (ft)
894.0
Rainfall
892.0
891.0
(4) 571 Lighthouse Rear Yard
890.0
889.0
884.0
6/19/2014 1:00
0.30
888.0
887.0
0.40
886.0
0.50
885.0
6/19/2014 3:24
6/19/2014 5:48
6/19/2014 8:12
Date/Time
6/19/2014 10:36
6/19/2014 13:00
0.60
Rainfall (in)
6/19/2014 1:00
6/19/2014 1:20
6/19/2014 1:40
6/19/2014 2:00
6/19/2014 2:20
6/19/2014 2:40
6/19/2014 3:00
6/19/2014 3:20
6/19/2014 3:40
6/19/2014 4:00
6/19/2014 4:20
6/19/2014 4:40
6/19/2014 5:00
6/19/2014 5:20
6/19/2014 5:40
6/19/2014 6:00
6/19/2014 6:20
6/19/2014 6:40
6/19/2014 7:00
6/19/2014 7:20
6/19/2014 7:40
6/19/2014 8:00
6/19/2014 8:20
6/19/2014 8:40
6/19/2014 9:00
6/19/2014 9:20
6/19/2014 9:40
6/19/2014 10:00
6/19/2014 10:20
6/19/2014 10:40
6/19/2014 11:00
6/19/2014 11:20
6/19/2014 11:40
6/19/2014 12:00
6/19/2014 12:20
6/19/2014 12:40
6/19/2014 13:00
6/19/2014 13:20
6/19/2014 13:40
6/19/2014 14:00
6/19/2014 14:20
6/19/2014 14:40
6/19/2014 15:00
June 19, 2014 (1.32")
0.00
893.0
0.10
(1) Spring Run
(2) 1016 Inlet Ct. Catch Basin
(3) 1016 Inlet Ct. Wetland
0.20
(5) 571 Lighthouse Catch Basin
Water Elevation (ft)
894.0
893.0
892.0
884.0
6/24/2014 12:00
(1) Spring Run
891.0
(3) Wetland 1016 Inlet Ct.
890.0
0.20
889.0
0.25
888.0
887.0
0.30
886.0
0.35
885.0
0.40
6/24/2014 19:12
6/25/2014 2:24
6/25/2014 9:36
Date/Time
6/25/2014 16:48
6/26/2014 0:00
0.45
6/26/2014 7:12
Rainfall (in)
6/24/2014 12:00
6/24/2014 13:00
6/24/2014 14:00
6/24/2014 15:00
6/24/2014 16:00
6/24/2014 17:00
6/24/2014 18:00
6/24/2014 19:00
6/24/2014 20:00
6/24/2014 21:00
6/24/2014 22:00
6/24/2014 23:00
6/25/2014 0:00
6/25/2014 1:00
6/25/2014 2:00
6/25/2014 3:00
6/25/2014 4:00
6/25/2014 5:00
6/25/2014 6:00
6/25/2014 7:00
6/25/2014 8:00
6/25/2014 9:00
6/25/2014 10:00
6/25/2014 11:00
6/25/2014 12:00
6/25/2014 13:00
6/25/2014 14:00
6/25/2014 15:00
6/25/2014 16:00
6/25/2014 17:00
6/25/2014 18:00
6/25/2014 19:00
6/25/2014 20:00
6/25/2014 21:00
6/25/2014 22:00
6/25/2014 23:00
6/26/2014 0:00
6/26/2014 1:00
6/26/2014 2:00
6/26/2014 3:00
6/26/2014 4:00
6/26/2014 5:00
6/26/2014 6:00
6/26/2014 7:00
June 24-25, 2014 Storm (2.64"/2.79")
0.00
(6) Rainfall
0.05
(2) Catch Basin 1016 Inlet Ct.
0.10
(4) 571 Lighthouse Rear Yard
0.15
(5) 571 Lighthouse Catch Basin
Water Elevation (ft)
884.0
7/7/2014 21:00
7/7/2014 23:24
7/8/2014 1:48
7/8/2014 4:12
Date/Time
894.0
Rainfall
891.0
(3) 1016 Inlet Ct. Wetland
890.0
(5) 571 Lighthouse Catch Basin
887.0
7/8/2014 6:36
7/8/2014 9:00
0.15
889.0
888.0
0.20
0.25
886.0
0.30
885.0
0.35
7/8/2014 11:24
Rainfall (in)
892.0
7/8/2014 12:00
7/8/2014 11:30
7/8/2014 11:00
7/8/2014 10:30
7/8/2014 10:00
7/8/2014 9:30
7/8/2014 9:00
7/8/2014 8:30
7/8/2014 8:00
7/8/2014 7:30
7/8/2014 7:00
7/8/2014 6:30
7/8/2014 6:00
7/8/2014 5:30
7/8/2014 5:00
7/8/2014 4:30
7/8/2014 4:00
7/8/2014 3:30
7/8/2014 3:00
7/8/2014 2:30
7/8/2014 2:00
7/8/2014 1:30
7/8/2014 1:00
7/8/2014 0:30
7/8/2014 0:00
7/7/2014 23:30
7/7/2014 23:00
7/7/2014 22:30
7/7/2014 22:00
7/7/2014 21:30
7/7/2014 21:00
July 7, 2014 Storm (1.10")
0.00
893.0
0.05
(1) Spring Run
(2) 1016 Inlet Ct. Catch Basin
0.10
(4) 571 Lighthouse Rear Yard
August 1, 2014 Storm (1.27")
894.0
0.00
893.0
0.05
Rainfall
892.0
(1) Spring Run
(2) 1016 Inlet Ct. Catch Basin
891.0
(3) 1016 Inlet Ct. Wetland
(4) 571 Lighthouse Rear Yard
890.0
0.15
(5) 571 Lighthouse Catch Basin
889.0
0.20
888.0
0.25
887.0
0.30
886.0
0.35
885.0
884.0
8/1/2014 12:57
0.40
8/1/2014 15:21
8/1/2014 17:45
Date/Time
8/1/2014 20:09
Rainfall (in)
Water Elevation (ft)
0.10
Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX E EXHIBIT 5 Sump Pump discharge connections. Stormwater Investigation at Mariner’s Cove May 8, 2013 Rev. February 7, 2014, Rev. August 27, 2014 APPENDIX F