Mecklenburg County Land Development Review
Site Checklist 2013
Project Name
Reviewer:
Contact:
Date Reviewed:
Telephone:
Telephone:
GENERAL SUBMITTAL REQUIREMENTS
Existing and proposed paved areas, buildings, structures & utilities.
Off-site construction or grading requires a letter from the affected property owner granting permission.
Is site adjacent to imminent NCDOT, Transit or Town project?
If yes, written approval is required from respective authority.
Zoning:
Parcel Tax Number:
Copy of Rezoning Petition in plans
CD Notes
Jurisdiction (Town or ETJ)
Vicinity map
Legible Scale (1:100 max)
North arrow
Property Boundary and Adjoining Property Boundaries, Owners, and Zoning
Pervious and Impervious Area (new and/or existing)
Adjacent existing streets & drainage
Title block w/ site name & location
Label Contours (2’ max. interval, existing & proposed)
Storm Drainage Calculations (Sealed)
SWIM Buffer Present
Watershed Overlay District (List drainage basin)
Surveyed Right of Way
Wetlands Permits (Army Corps/DWQ)
Sealed Retaining Wall Design (Note about shop drawings)
Retaining walls > 4 ft (residential) or 5 ft (commercial) in height requires a permit from Code Enforcement
prior to construction.
Retaining walls involving a culvert and/or located within the influence of a road must be reviewed and
approved by Land Development. Culverts must have headwalls or be collared. Geogrid may not be allowed
under pavement per Town policy. Utility conflicts with Geogrid must be considered.
Note on plans that construction of wall cannot begin until all necessary permits are acquired.
Huntersville – Retaining walls that are in and/or affect public right-of-way must be reviewed and approved
by the Town (Any questions contact Max Buchanan).
If project falls inside CATS corridor buffer, coordinate with David Carol or Brian Nadolny.
(Any project within 100’ of existing or proposed track layout)
CHECKLIST COMPLETION ITEMS (Grading Permit not issued until completion of all applicable items)
NCDOT Driveway Permit: 4 sets of completed applications with original signatures (copies are not allowed)
All applicable notes are on plans per MCLD Plan Notes Checklist
Health Department approval for proposed septic system locations
DWQ, Army Corps, and/or Water Quality (for buffer disturbance, SSMP) approval (if applicable)
Approved Floodplain Development Permit for any development within the Community Special Flood Hazard
Area
Town planning approval
All BMP easements and BMP Maintenance Plan (PCO 20), Operation and Maintenance Agreement/Declaration
of Covenants (PCO19) are recorded. These must be reviewed, and approved by LUESA staff. Copies of the
recorded documents must be received prior to plan approval.
BMP Inset Tables:
http://www.charmeck.org/stormwater/regulations/Pages/PCOSWManagementPermitsFormsCountyandSixTown
sOnly.aspx
All applicable items on Post-Construction checklist and/or LID checklist are resolved.
Post-Construction Plan Review Checklist can be found on the web at:
http://www.charmeck.org/stormwater/regulations/Pages/PCOSWManagementPermitsFormsCountyandSixTown
sOnly.aspx
Structural Plans for retaining walls, non-standard structures.
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Revised 2/2013
MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Grading and/or improvements within utility R/W or in other easements shall require a letter of approval from
the utility company.
Grading and/or improvements within railroad R/W shall require a letter of approval from the railroad company.
NCDENR Grading Permit (Required when government funds are used for projects. Examples: Hospital, Police
Station, Fire Station, Utility Projects, Mecklenburg County, Towns, Parks, etc.)
Aesthetics of utility structures in front of buildings. Locations of all utility structures (i.e. boxes, transformers,
backflow preventors, etc.) are shown on the plans. All aesthetic concerns must be resolved prior to plan
approval.
For subdivision plans which only show grading of the roadway, the following note shall be added to the plans.
Before any lots are denuded outside of the permitted area as shown on this approved set of plans, a revised
plan must be submitted and approved by Mecklenburg County LUESA Land Development staff. Any lot
development without a revision to the approved plan could result in immediate civil penalties being issued to
both the developer and home builder.
GOOSE CREEK WATERSHED (Site Specific Management Plan passed by NCDWQ as of 1/1/09)
The undisturbed buffers required in the SSMP are 200’ for streams with a 100-yr floodplain and 100’ for all
other streams/water bodies. These buffers are effective as of 1/1/09 and DO NOT have a development
“trigger”. They are not currently shown in POLARIS. For further information, refer to the following website
and “Charlotte-Mecklenburg Water Quality Buffer Implementation Guidelines”:
http://charmeck/stormwater/regulations/Pages/WaterSupplyWatershedRegulations.aspx
DRAINAGE AREA MAPS
All drainage area maps indicate project limits and are at a legible scale.
Drainage area maps clearly and legibly depict onsite and off-site areas (colored coded maps encouraged).
Maps are complete with properly labeled existing/proposed contours and indicate roof drainage direction.
Off-Site topography for drainage basins must extend to a point where ridgelines can be clearly identified.
Tc Travel Paths (pre/post) delineated on drainage area maps and labeled.
Erosion Control Basin map delineate and label the drainage areas for each phase of construction.
Storm drainage maps are labeled by inlet number and indicate acreage of drainage areas.
Subdivision Drainage Areas are depicted in the plan set.
Detention Basin maps show pre and post-development drainage areas and show SCS soil types.
Ground cover (trees, grass, pavement, etc.) is depicted on the drainage area map.
DRIVEWAYS AND NEW STREET ACCESSES
Driveway Applications (with original signatures)
4 original to NCDOT Newell Office (1 scanned copy submitted in EPM)
1 Town permit applications
Street Name
NC Route/Road Number
Typical Section(s) with Pavement Schedule
Wedging detail shown if required.
Left-turn lanes are required for sites serving 50 or more residential lots, on roads with ≥ 4000 ADT, or sitespecific for commercial property.
Roadway cross-sections on the existing street being accessed, every 50’ for length of proposed widening (See
NCDOT Cross-Section Guidelines). Include additional cross-sections 50’ before and after the widening.
Overlay asphalt for entire width for NCDOT-maintained streets (or to the middle of the nearest full lane for
Town-maintained streets). Overlay full width of road for symmetrical widening on an existing two-lane
roadway.
Traffic Control Plan that meets MUTCD and NCDOT and/or WATCH standards.
Traffic Control Phasing and Traffic Control Notes.
Pavement Marking Plan that meets MUTCD and NCDOT standards.
Sight Distance Profile:
Intersection sight distance based on AASHTO.
Measured 15’ back from the travel lane.
Plan and profile shall be shown for at least the distance of the profile in both directions.
Driver eye height and object height is 3.5’ above existing/proposed road surface.
Horizontal sight distance alignment: Lines of sight in both directions shall be shown and labeled.
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Vertical sight distance alignment: Show the centerline roadway profile of the existing street and the grades
along the lines of sight. A minimum of 1’ shall be provided between the grade and line of sight.
Include any potential conflicts. Sight triangle shall be clear of obstructions.
Sight distance easements may be required if lines of sight cross adjacent properties (i.e. curves in roadway,
limited frontage, etc.).
Clear Zone Requirements per AASHTO Roadside Design Guide.
Show all drive entrances to all properties along the existing street. Show all property lines.
Right-of-way line and Controlled Access line, if present. Right-of-way must be verified by a Professional Land
Surveyor.
Right of way adequate for improvements. Right of way acquisition for proposed road improvements shall be
acquired prior to plan approval.
Driveway Std. # and width
Corner radii labeled
Design vehicle turning templates
WB 50 – All commercial drives
SU 30 – Alleys
B-40 – Residential Street
P – Drive thrus, Parking Decks
Tapers for turn lanes per NCDOT Driveway Access manual
Existing and proposed storm drainage
Parking Spaces per MCLDS 50.09 or Town Ordinance
Traffic Circulation within the project (Fire trucks, buses, etc.)
Garbage collection
GRADING & EROSION CONTROL
(See the North Carolina Erosion and Sediment Control Planning and Design Manual (NCESCPDM) and the
Mecklenburg County Land Development Standards Manual [MCLDS], Mecklenburg County Soil Erosion
and Sediment Control Ordinance and Policies and Procedures guidelines)
Completed and notarized Financial Responsibility Form (if the financially responsible party is out of State, a
North Carolina agent must be assigned).
Copy of deed to prove ownership
Construction sequence (suggested sequence – see LD Plan Notes Checklist)
Denuded acres (outline denuded limits and list acreage)
Undisturbed buffer areas – Dimensions and locations (grading in a buffer requires zoning approval)
Swales, berms and temporary diversion ditches [MCLDS #30.05]
Location of on-site and/or off-site waste burial areas; location of borrow sites
Stabilized gravel construction entrance [MCLDS #30.11A]
Silt fence (Used for sheet flow only) [MCLDS #30.06A-D] [NCESCPDM 6.62]
Silt fence not installed across streams, ditches, or waterways, or other areas of concentrated flow.
Only for small-disturbed areas that are less then ¼ acre per 100 ft of fence and <2% slope (for greater
slopes, refer to NCESCPDM Table 6.62a)
Not be used alone below graded slopes greater than 10 ft. in height (Only steel posts are to be used)
10’ clearance is required between silt fence and the toe of any slope.
Inlet protection provided at all structures. Block and gravel [MCLDS 30.07] and hardware cloth and gravel
[MCLDS 30.09] must not be used near the edge of fill material and must not divert water over cut or fill slopes.
Ensure that drainage areas do not exceed 1 acre per inlet.
Slopes shall be graded no steeper than 2:1. Fill slopes greater than 10’ require adequate terracing [MCLDS
#30.16, NCESCPDM 6.02]. Soils engineer to verify stability of slopes greater than 2:1.
Sediment basins of any type shall not be placed in a road or other infrastructure that requires the basin to be
removed prior to final stabilization.
All proposed FES must discharge into a sediment control device or diverted to a basin until the drainage area is
stabilized.
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
All embankments must be constructed per Section 4.0.6 Embankment Requirements in the BMP Design
Manual. (Town of Huntersville only: Soil compaction tests are required on berms ≥ 5’ in height from the natural
grade. Soil compaction must be at 95% proctor and certified by a licensed soil engineer)
Temporary Sediment Trap (for drainage areas <5 acres not within watershed protection areas)
[MCLDS #30.01], [NCESCPDM 6.60]
Do not locate basins in intermittent or perennial streams.
Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of
storage) and the surface area at storage elevation.
Label basin contours and tie into existing contours.
Length to Width Ratio: Between 2:1 (min) and 6:1 (max)
Depth: 3.5 ft min. (1.5 ft excavated below grade)
Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 3,600 cf
Surface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)
Design of spillway for 10-year storm (Dimensions and calculations) Length: 10 ft min.
Baffles required: 3 min.
Skimmer Sediment Basin (for drainage areas <10 acres) [MCLDS #30.02A], [NCESCPDM 6.64]
Do not locate basins in intermittent or perennial streams.
Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of
storage) and surface area provided at spillway.
Label basin contours and tie into existing contours.
Length to Width Ratio: Between 2:1 (min.) and 6:1 (max.)
Depth: 2 ft min.
Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 1,800 cf
Surface Area (SA) required and provided: SA (sf) = (Q10) x (325 sf)
Design of emergency spillway for 10-year storm (Dimensions and calculations for permanent liner).
Length: 10 ft min.
1ft min. of bank freeboard above Q10 storm elevation (5’ max. dam height)
Skimmer and orifice sized to dewater basin in 2-5 days (Follow NCESCPDM manual for this criteria)
Detail of anti-seep collar and location. Collar must project 1.5’ min. from the barrel and be slightly
downstream from the dam centerline.
Baffles required: 3 min.
If an outlet structure is used, include the design of concrete ballast pad: Safety Factor=1.1 min. (Provide
calculations)
Sediment Basin (For drainage areas ≥10 acres but <100 acres) [MCLDS #30.03], [NCESCDM 6.61]
Do not locate basins in intermittent or perennial streams.
Flashboard risers are not allowed.
Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of
storage) and the surface area provided.
Label basin contours and tie into existing contours.
Length to Width Ratio: Between 2:1 (min.) and 6:1 (max.)
Depth: 2 ft min.
Side slopes: 2.5:1 min.
Min. top width of dam (W): 8’ for fill height <10’, 10’ for fill height 10’-15’
Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 1,800 cf
Surface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)
Design of emergency spillway for 10-year storm (Dimensions and calculations) Length: 20 ft min.
1ft minimum of bank freeboard above Q10 storm elevation
Skimmer and orifice sized to dewater basin in 24-72 hrs (Follow NCESCPDM manual for this criteria). For
extremely oversized basins, dewater basin in max. 5 days.
Design of concrete ballast pad: Safety Factor = 1.1 minimum (Calculations)
Detail of anti-seep collar and location. Collar must project 1.5’ min. from the barrel and be slightly
downstream from the dam centerline.
Design of riser and outlet pipe for 2-year storm (Calculations)
Baffles required: 3 min.
Sediment Basin with Rock Dam (for drainage areas <10 acres) [NCESCPDM 6.63]
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of
storage)
Length to Width Ratio: Between 2:1 (min) and 6:1 (max)
Depth: 3.5ft min. (1.5 ft excavated below grade)
Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 3,600 cf
Surface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)
Design of emergency spillway for 10-year storm (Dimensions and calculations) Length: 10 ft min.
Max. flow depth of 6” above bottom of spillway with a min. of 1 ft of freeboard to top of dam
Label basin contours and tie into existing contours
Baffles required: 3 min.
Baffles
[MCLDS #30.19], [NCESCPDM 6.65]
Locations of each baffle shall be shown with dimensions on plans.
The percent of surface area for each section of the baffle are as follows:
Inlet zone: 35%
Second cell: 25%
First cell: 25%
Outlet zone: 15%
Basin designed and placed to allow periodic cleanout.
Check Dam With Weir [NCESCPDM 6.87]
The weir length is variable to the size of the drainage area and peak runoff. The weir length may be sized as
follows: L(ft) = Q peak (cfs)
0.88
The apron length (downside of weir) should be approximately three times the height of the dam with a
minimum length of 4 ft.
Gravel & Riprap Filter Berm Basin – Inlet Protection (for pipes ≤36” and drainage areas <5 ac.)
[MCLDS #30.12], [NCESCDM 6.55]
Detail shown on plans
Do not install this measure in an intermittent or perennial stream.
Provide 3600 cubic feet of sediment storage per acre of disturbed drainage area.
Stone Inlet Protection (Temporary)”Rock Donut” [MCLDS #30.08], [NCESCDM 6.54]
Maximum drainage area is 1 acre
Place measure at least 30 ft away from vehicular traffic.
Creek Crossing – Creek shall be disturbed ONE time for the installation of the permanent crossing. Crossing of
creek using temporary bridge mats (or similar type crossing) must be discussed with the Erosion Control
Inspector.
Slope Drains [MCLDS #30.04] [NCESCDM 6.32]
Seeding schedule [MCLDS #30.17A,B] [NCESCDM 6.10, 11.1]
Minimum 10’ clear zone from Top of Channel Bank to denuded limit.
Wetland Protection measures (ex. 2 rows of silt fence separated with 6’-8’ between them)
ENHANCED EROSION CONTROL MEASURES
These measures are required to be installed in the areas identified in Attachment 1.
Surface water draw down devices (risers or skimmers) shall be installed in all sediment basins. Forebays shall
be used in conjunction with all sediment basins. Rock forebay embankments may be used in lieu of porous
baffles.
Polyacrylamides (PAM) shall be used to reduce turbidity and suspended solids whenever a sediment trap, basin,
pit, hole, or building foundation is being pumped out to remove sediment laden water. PAM is not required
when any of the above is being pumped to an approved sediment basin on site. This activity must be inspected
and approved by the Mecklenburg County erosion control inspector.
Double silt fence shall be used along wetlands, streams, lakes or other surface water bodies as well as adjacent
to all S.W.I.M. or other Water Quality Buffers. High hazard silt fence with wire backing and washed stone will
be installed as determined necessary by the County Engineer or field inspector.
The amount of uncovered area at any one time shall be limited to no more than 20 acres, unless approved by the
County Engineering.
A 10-foot undisturbed buffer shall be provided around the outside edge of drainage features such as intermittent
and perennial streams, ponds, and wetlands. Incidental drainage improvements or repairs will be permitted
within the buffer as approved by county staff.
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Installation of temporary ground cover or seeding must be performed within five (5) working days or slope
drains installed after fill slopes are brought up to height.
Permanent terraces shall be installed on 2:1 or steeper slopes over 19 feet in height to reduce runoff velocity
coming down the slopes.
STORM DRAINAGE (Refer to Storm Water Design Manual [SWDM] Chapters 3-8)
All design in accordance with the MCLDS and SWDM.
Provide details of all drainage structures or refer to MCLDS.
Location, size, invert and rim or grate elevations and pipe material for existing and proposed storm drains and
culverts on and immediately adjacent to the site.
Storm system pipes designed for 10-year storm [SWDM 3.5.1]
Where roadway overtopping is anticipated, drainage that is picked up in a culvert (or other drainage structure)
prior to crossing the road must be conveyed in a system designed for the 25-year storm (50-year storm for
thoroughfares). Flow calculations must be based on the appropriate design storm to the end of the system or to
a relief point lower than the street elevation.
Discharge leaves site in same direction and relative location as pre-developed condition.
Structures or flared end sections at all inlets and outlets of all pipe systems other than small outlets to rain
gardens. (CMP and HDPE FES are NOT allowed) [SWDM 6.5.9]
Non-standard drainage structures (CBs, DIs, MHs, JBs, HWs, FESs, bottomless culverts, etc.) will require
sealed construction drawings.
Minimum 2' cover on pipes (on Class III RCP, 1’ minimum cover on Class IV RCP).
The minimum allowable slope is 0.5 percent, or the slope which will produce a velocity of 2.5 fps when the
storm water in system is flowing full, whichever is greater. [SWDM 5.9.6]
Maximum velocity in pipes 20 fps (10 fps for CMP) [SWDM 5.9.2 & 6.5.4]
Maximum discharge velocity at pipe outlets is 5 fps (or the original velocity prior to development) [SWDM
6.5.4]
Rip rap required for all pipe outfalls (0% slope, Min. L=10’, Min. Depth=10”). Filter fabric must be placed
underneath. [MCLDS #20.23]
Corrugated metal pipes must be aluminum or aluminized steel.
Maximum of one (1) acre runoff draining into the street at one point.
No concentrated runoff flowing over City/County sidewalks except at driveway entrances.
Maximum spread of 6 feet (or half a travel lane) on public streets based on rainfall intensity of 4 in/hr [SWDM
1.3]. An additional 1 ft is allowed for valley curb and 1’-6” curb and gutter, and 2 ft for 2’-6” curb and gutter.
Slope less than 2% across intersections may need additional CBs and spot elevations to prevent intersection
flooding.
Catch Basin placement at intersections [MCLDS #10.30]
Check drainage at stub streets (i.e. spread, future culvert crossings, and 100+1 culvert analysis)
Crossdrains/Culverts must meet the following criteria:
Culverts – Minimum diameter of 18”
100-yr storm does not exceed 6” over the road
Cross-drainage on thoroughfare classified roadways – 50-yr storm (25-yr storm for minor roadways)
12” freeboard for culverts ≤ 3’ in diameter (25-yr storm)
18” for all culverts > 3’ in diameter (25-yr storm)
Maximum ponding at yard inlets is 1’ with 6” freeboard for design storm
HW/D ≤ 1.2
Check applicability of Culvert Crossing [MCLDS #10.36A & 10.36B]
Standard Headwall detail is referenced or design sealed by Engineer
For bottomless culverts, upstream and downstream footer elevations shown
Existing creek/channel typical section
Roadway cross-section at culvert crossing @ legible scale
Pipes in R/W 48” or less in diameter may be HDPE or RCP, >48” may be RCP, >60” may be aluminized steel;
minimum 15” (any HDPE pipe used within one of towns shall have the public works approval and bedding
material and 3rd party certified).
Provide details of curb cuts and flumes.
Properly sized and labeled Storm Drainage Easements (SDE) [MCLDS #20.30]. Specify who will maintain
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
these easements. Storm Drainage Easements must extend down stream of flared end sections to an appropriate
property line or buffer. Overlapping of storm drain easements shall be approved by the County Engineer.
CHANNEL DESIGN (Refer to Storm Water Design Manual Chapter 4)
Channel cross-sections and calculations
Max. 2:1 side slopes [SWDM 4.3.1]
Designed for 10-yr storm
Min. 6” freeboard
The final design of artificial open channels should be consistent with the velocity and shear strength limitations
for the selected lining [SWDM 4.3.4]
Liner specifications and design information from manufacturer.
Transition to channel sections with a minimum of 5:1 taper [SWDM 4.3.1]
Channels with bottom widths > 10' must have a minimum bottom cross slope of 12:1 [SWDM 4.3.1]
Properly sized and labeled storm drainage easement (SDE) [MCLDS #20.30]
Driveway pipes sized for Q10, check for roadway overtopping as required.
100+1 FLOOD ANALYSIS [Q100>50 cfs]
For pipe systems not designed for Q100 that receives >50 cfs in Q100, flood protection analysis is required.
Flood study calculations shall be sealed by PE.
Calculations for flow and tc
Runoff coefficients shall be based on assumption of full development of parcels per current zoning.
Include digital copy of channel analysis input file in submittal (e-mail or CD-R acceptable).
Proposed FPE/SWPE (based on jurisdiction) shall be labeled on site and grading plan for each lot.
Show and label location of 100+1 Building Restriction Floodline/Storm Water Elevation Line (based on
jurisdiction) on site and grading plan.
Minimum 1,200 sf of buildable area per lot.
Show or describe on plans the location and elevation (ref. vertical datum, i.e. NAVD 88) of permanent
benchmark used in channel survey. All topographic information shown on grading plans shall also be
referenced to this benchmark. All flood studies shall be done using the NAVD 88 datum.
Existing channel cross-section geometry used in analysis shall be based on a “Class A” field survey and shall be
sealed by RLS.
When fill is proposed within the 100+1 Building Restriction Floodline, plotted channel cross-sections shall
be included in the subdivision plan set and shall show both existing and proposed cross-section geometry.
Sheets to be signed by RLS for existing and PE for proposed conditions.
When no grading is proposed within the 100+1 Building Restriction Floodline, it is not necessary to include
plotted cross-sections in the subdivision plan set. A note shall be added to the grading plan specifying that there
shall be no grading within the limits of the 100+1 Building Restriction Floodline.
Cross-sections taken perpendicular to the stream centerline, maximum 100’ stations
Plot cross-sections showing the 100+1 elevation on site and grading plan.
Cross-sections based on topographic map are subject to approval of the Review Engineer.
Minimum of 5 cross-sections provided downstream of culvert (additional cross-sections may be required to
determine the correct water surface elevation).
Contraction and expansion coefficients (0.6, 0.8) applied at 1.5:1 from the edge of pipe to the existing bank.
Ineffective flow is applied in correct locations based on 1.5:1 and bank geometry.
In case of a bridge or culvert:
Cross-sections should be prepared at 5 feet from inlet and 5 feet from outlet
Road profile at culvert crossing to an elevation 2 feet above the low point of road
A physical description of the culvert (type, shape, invert, etc.)
* Upstream and downstream top of footer elevations for natural bottom culverts
Flood Protection Elevations (FPE)/Storm Water Protection Elevation (SWPE) (depending on jurisdiction)
for lots upstream of street crossings shall be based on the higher of the elevation determined by analysis or the
low point of the road plus 1 foot.
Maximum height of flow over a street is 6”.
FLOODWAY [Drainage Area > 640 Acres]
Show and label Creek name and centerline along full extent of project.
Floodway Cross-sections – Label the cross-section ID, FEMA Flood Fringe Elevation and the Future
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Conditions Flood Fringe Elevation.
Label the following lines clearly on grading and site plan:
Community Flood Fringe Line
FEMA Flood Fringe Line
Community Encroachment Line
FEMA Floodway Encroachment Line
Flood Protection Elevations/Storm Water Protection Elevation (FPE/SWPE) for all lots that touch the
Community Special Flood Hazard Area. FPE/SWPE must be based on the Community Base Flood Elevation
plus applicable freeboard for the project’s jurisdiction.
Note on plans: The Community Encroachment Line must be clearly marked prior to any grading and the
marked line must be maintained on site until final grading is completed.
Contact David Love at (704) 432-0006 concerning Floodplain Development Permit if grading within a
Community Special Flood Hazard Area. Approval required prior to plan approval.
DETENTION [Refer to Storm Water Design Manual - Chapter 7], {Post Construction requirements may differ
from the below requirements, refer to Post Construction Administration Manual if applicable}
For designs using HydroCad, all electronic files are to be provided for review. For all other programs, the
designer is to submit a storm water summary sheet for each watershed.
Design for release rate of pre-developed 2-yr & 10-yr storm (6hr or 24hr storm) [SWDM 7.3.2]
Routing calculations are required for storage volume and emergency spillway (sealed) [SWDM 7.3.3]
The same hydrologic procedure shall be used to determine pre- and post-development hydrology.
Design Calculations must include:
Calculations for pre & post-development weighted runoff coefficients
Coefficients shall be specified and justified. Soil survey showing soil type shall be included. Good
condition shall be used.
Time of concentration calculations (use SCS method) [SWDM 3.9.6.1]
Time of concentration travel path (clearly label segments on contoured drainage area map)
Inflow hydrograph for all design storms for fully developed and pre-developed conditions [See Chapter 3
of SWDM for approved inflow hydrographs]
Stage-storage table for proposed storage facilities.
Stage-discharge table for all outlet control structures.
Undetained runoff must be accounted for in calculations.
All detention volume shall be drained within 72 hours.
Emergency spillways for ponds shall be designed to pass the 50-yr storm [SWDM 7.3.2] (Lined in fill areas)
Maximum 6”depth of storage in code-required parking areas, 10”in additional parking areas, 15” storage
allowed in truck storage and loading areas (depth based on 10-yr storm). [SWDM 7.3.3]
Limits of 10 yr detention storage elevation in parking lots labeled.
Maximum slope on basins of 2:1 [SWDM 7.3.4]
Minimum 6” freeboard above 50-year elevation on earthen basins (on basins less than 15' deep) [SWDM 7.3.4]
Any orifice smaller than 4” in diameter must have a trash rack. Provide detail. [SWDM 7.5.6].
Locate & label on site plan the elevation of dam with dimensions and spot elevations.
Locate & label on site plan the location of primary and emergency outlets.
Provide detail of outlet restrictive device.
2-yr and 10-yr 6 hour storm, good pre-developed condition must be used when applying for Storm Water fee
credit.
No utilities or habitable structures within impoundment areas.
Detention facilities are not allowed within required buffers. [Zoning Ordinance 12.302]
Detention facilities are not allowed within the existing or proposed R/W. [Zoning Ord. 12.103]
Underground Detention systems
All pipes must maintain a minimum 0.5% slope.
All pipe network nodes labeled with spot elevations.
Adequate access for maintenance at control structures (cleanouts).
Upper reaches of system provided with access points and proper ventilation.
Discharge point for 50-year storm is evaluated.
Regional Detention Basins or Easements Recorded to the Floodway
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
Drainage Area map with clear delineation of parcels served.
Pipe systems/channels from site to regional facility/floodway sized for 10-yr storm water runoff.
Permanent Detention Easements labeled on plans. [MCLDS #20.30]
Off-site detention requires Permanent Detention Easement recorded at Mecklenburg County’s Register of
Deeds. (Easements must be reviewed by Mecklenburg County LUESA)
BMP Design (refer to current Charlotte-Mecklenburg BMP Design Manual)
SWIM STREAM BUFFERS
Buffer widths are shown and labeled on plans and are correct based on POLARIS.
Plans indicate that all engineered channels, piped outfalls, and rip rap aprons end outside of the buffer.
Drainage outfalls must be designed to allow water to sheet flow across the buffer to filter out pollutants.
Energy dissipators, diversion devices or wetland flow must be used to spread concentrated flows and must be
located outside the buffer area. Adequate vegetative cover must be retained or re-established below energy
dissipators to prevent erosion.
No outlet drains more than 10 acres drainage area to any one point in a stream buffer.
Where disturbance to the buffer is shown, a letter from Water Quality is required stating that the disturbance
shown is allowable or whether a mitigation plan has been approved.
All temporary sediment basins and all other erosion control devices are located outside of the minimum buffer
width.
Plans clearly indicate that NO fill material is to be brought into the buffer and that no structures are allowed
within any of the buffer areas (except non-commercial out buildings not exceeding 150 square feet).
Buffer Delineation
Buffer area is clearly identified on plans in bold, clear type as “S.W.I.M. STREAM BUFFER”.
The outside boundary of each buffer zone is clearly marked and labeled on plans (stream side, managed use,
upland).
Field located top of bank from where the buffer width is measured is labeled on plans.
The outside boundary of the buffer must be permanently marked with an iron pin or other acceptable.
property corner marker at all street crossings. The iron must be called out on the plans.
Show orange fabric fencing on Grading and Erosion Control Plans.
Streams and buffer boundaries including the delineation of each zone and a dimension from a specific
location are shown on all surveys and record plats, including individual record plats for any lots affected.
Where applicable for 100’ buffers/50% additional width: Provide calculations for 50% additional width
based on the area between the current 100-year FEMA FRINGE BOUNDARY to the 100’ SWIM Buffer or the
0.1 FLUM Encroachment line, whichever is less.
IMPROVEMENTS TO EXISTING RIGHT-OF-WAY
Offsite R/W requirements shown on plans (for symmetrical widening, off-site frontage improvement tie-ins,
etc.).
Need R/W agreement (recorded) for road widening and/or improvements where there is no existing R/W
Storm drainage associated with street improvements.
Show and label cross-section and profile of existing street with proposed improvements (i.e. curb and gutter,
sidewalk, pavement section, ditch cross-section, associated drainage, etc.).
If the existing street is maintained by NCDOT, a NCDOT Encroachment Agreement is required for the
proposed improvements (contact NCDOT, 704-596-6900).
Bicycle improvements along roadway may be required (check Bikeway Improvement Plan map or Town
Ordinance).
Rezoning petition could list requirements for additional or non-standard right-of-way improvements. Copy of
rezoning petition shall be included in the plans.
As of 4/8/09, the increase in impervious area due to widening of existing roads MUST be included in the BUA
and MUST be included in the sizing of the development’s BMPs.
On-street parking dimensions meets MCLDS 50.09 and/or Town Ordinance.
Design exceptions accepted by the Town must be noted on the plans.
Page 9 of 12
Revised 2/2013
MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
When a proposed street ties into an existing street (classified below), street improvements may be required:
Commercial
Commercial
Arterials
Collectors
Arterials
Collectors
MCLDS #11.11,
MCLDS# 11.09
MCLDS# 11.09
MCLDS# 11.06
Property Frontage Typical
11.12
Major: 100’*
100’ Dedicated
Right-of-way width
See Town
See Town
Minor: 70’*
50’ Reserved
Curb & gutter
2’6” OR
2’6”
2’6”
2’6”
(MCLDS#10.17)
2’0”
24’ (to locate
24’ (to locate
C/G Turn out from CL to F/C
17’
20’
sidewalk)
sidewalk)
Sidewalk, Planting Strip
See Town
See Town
See Town
See Town
8’ (6’ for NC8’ (6’ for NCMinimum Shoulder
8’
8’
maintained)
maintained)
Recommended Taper
100’
100’
50’
50’
• R/W widths different for urban arterials (see MUMPO Thoroughfare Map)
PUBLIC STREETS
Typical sections must conform to MCLDS standards
Accessible ramps required at all intersections. [MCLDS # 10.31 thru 10.35]
Taper from local to local-limited. [MCLDS #10.37]
Bicycle improvements along roadway may be required
AASHTO sight triangles at intersections
CUL-DE-SACS
Residential [MCLDS # 11.16] with appropriate pavement radius
Commercial [MCLDS # 11.17]
Provide spot elevations along lip of cul-de-sac to insure positive drainage for profiles ≤ 2%
 42' recommended to allow for emergency vehicles turning with minimal reverse movement. R/W must be adjusted to accommodate larger pavement radius.
PRIVATE STREETS and ALLEYS
Maximum grade 10%
Minimum horizontal radius at CL determined by design vehicle
Show limits of private street
Vertical curve K-values (crest/sag 10/20)
Typical section per MCLDS #11.13
Residential alley details per MCLDS #11.19
AASHTO sight triangles at intersections with a public street
Parking bays allowed on only one side of the street unless a median is provided
HORIZONTAL AND VERTICAL REQUIREMENTS
Use of level or hilly terrain criteria not permitted without prior approval of the Review Engineer
Terrain Classification -Slope Range (%)
Minimum Sight
Distance
Maximum Grade (%)
Minimum Grade (%)
Minimum Radius (ft)
K Values (Crest/Sag)
Minimum tangent
between Horizontal curves
Local
Collector
Local
Collector
All
Local
Collector
Local
Collector
Local
Collector
Level (0-8)
Rolling (8-15)
Hilly (15+)
See AASHTO
See AASHTO
6
10
12
4
8
10
0.5
0.5
0.5
250
See Town
90
350
See Town
175
28/35
20/20
15/20
40/45
28/35
20/20
50
50
50
100
100
100
(NO REVERSE CURVES)
Show profiles with vertical data and storm drainage for all proposed streets (Public and Private).
Provide horizontal curve data (Public and Private).
Profiles for streets to be barricaded must extend 300 feet beyond the phase/property line or to the proposed
Page 10 of 12
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MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
future end of the street, whichever is less. [MCLDS #50.07, 50.08]
Non-symmetrical vertical curves must have L1 or L2 ≥ one-third of total length.
Thoroughfares – refer to AASHTO "A Policy on Geometric Design of Highways and Streets"
INTERSECTIONS
Terrain Classification-Slope Range (%)
Clear sight distance (ft.)
Vertical alignment (max) within 100' (%)
Minimum angle of intersection (°)
Minimum curb and
R/W radius
Minimum offset to adjacent
intersection (ft)
Level (0-8)
Rolling (8-15)
See AASHTO
5
75
75
Local
20
See Town
Collector
30
See Town
Local
125
125
Collector 200
200
Hilly (15+)
75
20
30
125
200
FIRE DEPARTMENT ACCESS REQUIREMENTS
Fire apparatus shall access within 150 feet of all exterior walls. (NC Fire Code 503.1.1)
Dead-end fire access roads in excess of 150 feet in length shall be provided with an approved area for
turning around fire apparatus. (NC Fire Code 503.2.5)
Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (measured from
FOC to FOC) and an unobstructed vertical clearance of not less than 13 feet 6 inches. (NC Fire Code
503.2.1)
Turning radii required is 42 feet outside and 30 feet inside. (NC Fire Code 503.2.4)
Fire apparatus access roads shall be designed and maintained to support the imposed loads of fire
apparatus (80,000 lbs) and shall be surfaced so as to provide all-weather driving capabilities. (NC Fire
Code 503.2.3)
Multifamily buildings – Emergency ladder access shall be provided from a finished grade that is no
more than 15% maximum slope for a distance of 12 feet
Buildings over 3 stories must have frontal clearance for rescues
Building Code – Minimum 20’ separation between buildings (measured to/from eaves) or firewalls
Utility plans must show location of fire hydrants, water lines, and size of water line
Fire hydrant required within 750 feet of most remote point of building as the truck travels
Fire hydrant required within 200 feet of fire department connection of all sprinklered commercial
structures and 750 feet to residential sprinklered structures
Six-inch dead end water mains serving a hydrant may not exceed 350 feet
Page 11 of 12
Revised 2/2013
MECKLENBURG COUNTY ENGINEERING LAND DEVELOPMENT REVIEW
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Attachment 1: Enhanced Erosion Control Requirement Areas
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303(d) listed streams, including land within 500' of the stream
Goose Creek Watershed Area
McDowell Watershed Area
Critical Watershed Districts for Lake Norman, Mt. Island, and Lake Wylie
Protected Watershed districts for Lake Norman, Mt. Island, and Lake Wylie
Page 12 of 12
Revised 2/2013