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COUNTY OF LOS ANGELES
MIRA LOMA DETENTION CENTER
45100 60th Street West.
Lancaster, CA 93536
July 30, 2014
Hydraulics/Hydrology and Site Storm Drainage System
Prepared For:
DLR GROUP
3130 Wilshire Blvd., 6th floor
Santa Monica, CA 90403
Prepared by:
VIRGIL C. AOANAN, P.E., S.E., QSD
Los Angeles
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TABLE OF CONTENTS
1.0
INTRODUCTION ................................................................................................................................. 1
2.0
PROJECT SITE HYDROLOGY ............................................................................................................. 1
2.1
HYDROLOGY DATA, DESIGN CRITERIA ........................................................................................ 2
2.2
PROJECT LOCATION ...................................................................................................................... 3
3.0
EXISTING SITE CONDITION AND STORM DRAINAGE SYSTEM ........................................................ 3
3.1
GEOTECHNICAL REPORT .............................................................................................................. 3
3.2
GROUNDWATER LEVEL ................................................................................................................ 3
3.3
INFILTRATION RATE ..................................................................................................................... 3
4.0
PROPOSED STORM DRAINAGE SYSTEM ........................................................................................... 5
.......................................................... 5
4.1
EXISTING AND PROPOSED PERVIOUS / IMPERVIOUS AREA
4.2
PROPOSED RUNOFF CONVEYANCE AND DISCHARGE SYSTEM .
4.3
CATCH BASIN , BIOSWALE , INFILTRATION STRUCTURE . ............................................................. 7
5.0
5.1
6.0
.................................................. 5
LOW IMPACT DEVELOPMENT ........................................................................................................... 7
STORMWATER QUALITY DESIGN ................................................................................................. 8
PROJECT CONCLUSIONS AND RECOMMENDATIONS ....................................................................... 8
1
Los Angeles
3951 Medford Street, Los Angeles CA 90063
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e-mail: vca@vcaeng.com
I r v in e
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T e l: 9 4 9 - 6 7 9 - 0 8 7 0 ▪ Fa x: 9 4 9 - 6 7 9 - 9 3 7 0
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INTRODUCTION
This Hydrology Report summarizes the storm drain design criteria, Low Impact Development (LID) and Standard
Urban Stormwater Mitigation Plan (SUSMP). The report provides general information about the existing
condition, site hydrology, Low Impact Development requirements, and site storm drainage system.
This report is to provide insights to the design and build contractor the basic need of the site to comply with all
applicable code, regulation and AHJ’s the storm water management requirements. Design and build contractor
should design the proposed drainage system of the project to adequately meet the drainage needs of the project
site including LID and SUSMP requirements. Among the list includes the design of the following:





Storm Drain System – hydraulics, pipe and pipe sizing
Catch Basins
Retention/Detention Structure
Infiltration, Filtration and other Low Impact Development application
Mechanical Cleaning Device Using Continuous Deflection Separation or Filter Inserts
Standards
The following Standards have to be used but not limited to in complying with Storm Water Management for this
project.
1.
2.
3.
4.
5.
LA County Hydrology Manual (2006)
County of Los Angeles Low Impact Development (LID) Standards Manual (2009)
Standard Urban Stormwater Mitigation Plan (SUSMP) Manual (2002)
Development Best Management Practices Handbook (2012)
California Green Building Standards Code, California Code of Regulations, Title 24, Part 11 (2010)
2.0
PROJECT SITE HYDROLOGY
Site Description
The existing site storm drainage conditions do not meet current design requirements and is determined to be under
designed per the design guidelines of the County of Los Angeles Hydrology Manual 2006 25-year storm event.
A majority of the stormwater runoff is allowed to sheet flow off the site without considering the Best Management
Practices of the Standard Urban Stormwater Mitigation Plan.
Project Redevelopment Area
Project limit of work incorporates approximately 38 acres within AB 900 boundary line. Design and build
contractor may choose how the storm water will be collected, treated and discharge based on applicable code,
regulation and standard. The information provided under this report is a schematic guide for design of storm
drainage system. Based on the schematic sketch, the proposed redevelopment area was divided into three separate
tributary areas.
Los Angeles
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Project Location
Mira Loma Detention Center is located in the City of Lancaster at the southeast intersection of West Avenue I
and West 60th Street. Project site address of the facility is 45100 60th Street West Lancaster, CA 93536 with an
approximate coordinate: Longitude of 34o 42’ 2” and Latitude of 118o 13’ 59”.
2.1
HYDROLOGY DATA , DESIGN CRITERIA
The following hydrology data and design criteria are used in the calculations of the runoff.
Basis of Design
For this project the Los Angeles County Department of Public Works – Hydrology Manual, January 2006 for
storm drainage system was used, Los Angeles County Low Impact Development Manual and guidelines. The
Hydrology Calculation for Storm Flow Rate for the total drainage area were based on the Modified Rational
Method.
The analysis of the hydraulic characteristic of the storm drain system is performed using the Tc- Calculator
Method. Manning's Equation for the calculation of the storm drain pipe sizing. The catch basins design
calculations are carried out based on the capacity of the flow rate from the draining subarea to the individual catch
basin and are designed for the largest flow from the Tc calculations.
Rainfall Depth
The rainfall at this specific project site is 3.10 inches for 50-year, 24-hour and 2.72 inches for 25-year, 24-hour.
The rainfall depth was found from the Los Angeles County Hydrology Manual 2006.
Soil Type
The numerical soil classification used for the project is 120 and was found from the Los Angeles County
Hydrology Manual 2006.
Percentage of Imperviousness
The percentage of imperviousness for the propose post-development within the project scope is unknown at this
moment but for calculation purposes only it will be assumed at 82% of the total area. Design and build contractor
to verify this during design and use the calculated numbers to their pipe sizing and hydrology analysis.
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
I r v in e
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PROJECT LOCATION
Mira Loma Detention Center is located in the City of Lancaster at the southeast intersection of West Avenue I
and West 60th Street. Project site address of the facility is 45100 60th Street West Lancaster, CA 93536 with an
approximate coordinate: Longitude of 34o 42’ 2” and Latitude of 118o 13’ 59”.
3.0
EXISTING SITE CONDITION AND STORM DRAINAGE SYSTEM
The site generally slopes from North West to South East (some to the Eastside) through v –gutter and sheet flow
along the existing pavement. The storm water run-off discharges directly to offsite around the site without proper
treatment (see Figure 1). Underground storm drainage system information are unknown and the available as-built
drawing does not provide show any underground storm drainage pipe. Another verification information Although
topographic survey shows few isolated catch basins around the project site yet the underground storm drainage
line are unknown.
3.1
GEOTECHNICAL REPORT
Information and recommendations from the soils report prepared by Converse Consultants entitled “Geohazard
Study Report” Mira Loma Detention Center, dated June 12, 2014, which are relevant to hydrology and hydraulics
of the project site is partly included on this report. See attachment in page 35.
3.2
GROUNDWATER LEVEL
Perched groundwater was encountered during the subsurface exploration at depths approximately of 27 feet below
the ground surface. The historic high groundwater level in this area ranges from approximately 110 to 150 feet or
more below the existing ground water surface.
3.3
INFILTRATION RATE
From the geotechnical report, the percolation rate of the site has an approximately 1.47 in./hr. From the four
boring numbers tested. In accordance with County of Los Angeles requirements, the minimum percolation rate
for design of infiltration system for the storm water management is 0.50 inch/hour. See attachment in page 35.
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
I r v in e
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FIGURE 1
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
I r v in e
2151 Michelson Dr. # 242, Irvine, CA 92612
T e l: 9 4 9 - 6 7 9 - 0 8 7 0 ▪ Fa x: 9 4 9 - 6 7 9 - 9 3 7 0
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4.0
PROPOSED STORM DRAINAGE SYSTEM
4.1
EXISTING AND PROPOSED PERVIOUS /IMPERVIOUS AREA
Based on topo survey determination of pervious impervious area of existing site, it is difficult and challenging to
clearly recognize paved, dirt, and planter area due to unclear identification of the said features. For estimating
purposes, the pervious is approximately 15.50 acres and the impervious area is about 28.50 acres from a total of
44 acres AB 900 Project improvement boundary.
At schematic level of the proposed site, defining the landscape, planter area can be challenging as this will change
over few more revisions from concept to construction document. Design and Build contractor will have to verify
this during the project design stage and identify the design pervious/impervious of the site. For purposes of
providing hydrology report and guide, VCA approximated the proposed improvement pervious / imperviousness
of the site to have it at between 15 to 20% pervious and between 80 to 85% impervious.
Table 1 – Existing and Proposed Impervious/Pervious Areas
Site Condition
Pervious Area
(Acres)
Impervious
Area (Acres)
%
Pervious
%
Impervious
Existing
15.43
28.34
35.00
65.00
Proposed
7.80
35.97
18.00
82.00
Note: The above figures are for design guide and reference only. Design and build contractor to
calculate, verify existing and the proposed pervious and impervious component.
4.2
PROPOSED RUNOFF CONVEYANCE AND DISCHARGE SYSTEM.
Runoff conveyance is a method of safely storing storm water to a LID receiving planter area or infiltration
structure promoting infiltration or filtering of the runoff. Discharging describes the different types of ways the
storm water runoff are released from the project site. A schematic storm drainage system on figure 2 provides an
insights on how the drainage can be handled, treated and discharge. Design and build contractor needs to design
the drainage system that addresses the hydraulics and hydrology of the project and in compliance with the
applicable requirements. The grading for the new facility should drain towards the catch basin, bioswale, planter
box, and/or underground infiltration structure and ultimately treat the run-off water before discharge. The onsite
drainage system conveys and discharges runoff from the site to a catch basin with filter inserts as pre-treatment,
then through a bioswale area and eventually to the infiltration structures, and bubbler catch basin with an overflow
to the street or adjacent land area.
Infiltration structures should be sized to handle 100% retention with a
drawdown time of less than within 48 hours.
Storm drainage pipe sizes will have a 6” diameter as a minimum size and can be as big as between 18” to 30”
diameter pipe size on the main line depending on the tributary area, slope of the pipe and number discharge points.
Design and Build contractor will have to base their sizing based on their design options. The schematic storm
drainage shown on the narrative, sketches, plan are for reference and guide only.
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
I r v in e
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FIGURE 2
Los Angeles
3951 Medford Street, Los Angeles CA 90063
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I r v in e
2151 Michelson Dr. # 242, Irvine, CA 92612
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4.3
CATCH BASIN , BIOSWALE , INFILTRATION STRUCTURE.
Catch Basin
The catch basin design calculation is carried out based on the capacity of the flow rate from the draining subarea
to the individual catch basin and was designed for the largest flow from the LA County Tc calculator Version
2.03. There is one size of catch basin used in this project, 12” x 12”. See Part II: Calculations, Attachment II-4
for calculation spreadsheets.
Bio Swale
The design frequency used for this project was a 25-year, 24-hour storm event. This design frequency is used
under the LA County Hydrology Manual (2006).
Infiltration Retention Structure
Infiltration retention structure is a combination of Chambermaxx Retention System and Ecorain Tank (or
approved equal) underneath the surface area. These infiltration structures will capture the surface stormwater
runoff that flows into the catch basins and from the bio-swale area as a pre-treatment then collected to the
infiltration structure where eventually the stored volume capacity will percolate down to the ground. Excess
water will overflow to and discharge clean to the street or adjacent undeveloped land area.
5.0
LOW IMPACT DEVELOPMENT
Low Impact Development (LID) is a new approach to managing rainfall and stormwater runoff. LID practices
were designed to protect surface and groundwater quality, maintain the integrity of ecosystems, and preserve the
physical integrity of receiving waters by controlling rainfall and stormwater runoff at or close to the source. LID
is being applied to this project per LA County. This project will prioritize the selection of Best Management
Practices (BMPs) to treat stormwater pollutants and reduce stormwater runoff volume.
Per LID requirements, BMPs should be implemented in the following hierarchy:
1.
2.
3.
4.
5.
Infiltrate
Biofiltration
Capture and use
Mechanical Device
Combination of above
The BMPs that will be used are infiltration and mechanical device.
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
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5.1
STORMWATER QUALITY DESIGN
The peak volume to be mitigated designed with a 3/4 inch of rainfall is determined based on the Los Angeles
County Department of Public Works SUSMP Manual dated September 2002. A 3/4-inch 24-hour storm event
was used and the result for the Stormwater Quality Design Volume (SQDV) is approximately 90,000 cu.ft. are
were distributed into three (3) different location as shown on schematic storm drainage plan.
The drawdown time is an LA County requirement where it would have to meet a minimum of 48 hours for all the
water infiltrated through the system.
6.0
PROJECT CONCLUSIONS AND RECOMMENDATIONS
After analysis of the site hydrology of the existing and schematic propose improvement of the site, the following
are the recommendations of VCA Engineers but this information is not limited to the items provided below.
Design and build contractor needs to verify and design required parameters in compliance with all applicable
codes, regulation, standard and jurisdictional requirement.
1. The existing storm drainage system needs to be redesigned to comply with the stormwater quality and
quantity control before it is discharged to street. The proposed storm drainage system must be adequate
to convey the peak flow rate due to the 25-year, 24-hour rainfall depth.
2. The retention system, and infiltration structure to be sized accordingly with consideration of the
percolation rate provided by geotechnical engineer and should be adequate to capture and treat the
stormwater runoff from the project site. Drawdown volume capacity at 48 hours must also be verified
and calculated to satisfy this requirement.
3. Total capacity retention volume of stormwater runoff of the infiltration structures should accommodate
the stormwater runoff from the project site. Provide and utilized an overflow line that will discharge
clean to the adjacent street of undeveloped area (within the project property) approved by jurisdictional
agency.
4. Provide pre-treatment method of cleaning for storm water run-off such as filter inserts in a catch basins,
continuous deflection system storm interceptor (CDS) or other equal products that will insure the quality
of the run-off prior to the infiltration system or discharge area.
5. Provide maintenance program will include the following key components:
a. Inspection and removal of sediment, debris, and other pollutants on containment chambers and detention
structure per manufacturer recommendation.
b. Sediment and debris (litter, leaves, papers, cans, etc.) within the area, especially around the trench drains and
catch basins with filter inserts, will be collected and removed.
c. The frequency of sweeping will be based on the amount of sediment and debris generated.
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
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T e l: 9 4 9 - 6 7 9 - 0 8 7 0 ▪ Fa x: 9 4 9 - 6 7 9 - 9 3 7 0
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HYDRAULICS/HYDROLOGY
CALCULATIONS AND REFERENCES

Tc Results – 25 year, 24 Hour Storm Event………….…….……..… 10

Peak Mitigated Flow / Quality Volume………….…….……………
11

Hydrology Map………….…….….…….…………….…….……….
12

Hydrology Map Locator………….…….…………….…….…….…. 13

Soil Type………….…….…………….…….…………….…….…...

Percolation Test (from Geotechnical Report Info) ………….…..….. 15

Cut Sheets………….…….…………….…….…………….….…..… 16
14
-
Chambermaxx………….…….…………….…….……………. 16
-
Ecorain Tank………….…….…………….…….………….….
-
Filter Inserts………….…….…………….…….…………...…. 18
-
Continues Deflection System………….…….……………...…
19

SUSMP Calculation………….…….…………….…….……………
20

Detention Tank Calculation………….…….…………….…….……
21
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3951 Medford Street, Los Angeles CA 90063
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TC CALCS FOR 25-YEAR, 24 HOUR STORM EVENT:
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PEAK FLOW
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PEAK MITIGATED FLOW/ QUALITY VOLUME:
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HYDROLOGY MAP:
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HYDROLOGY MAP LOCATOR:
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SOIL TYPE:
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PERCOLATION TEST:
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CHAMBERMAXX: INFILTRATION/DETENTION STRUCTURE
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3951 Medford Street, Los Angeles CA 90063
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e-mail: vca@vcaeng.com
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FILTER INSERTS:
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CONTINUOUS DEFLECTION SEPARATOR:
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www.vcaeng.com
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V CA
QUALITY
SERVICE
COMMITMENT
CIVIL
MBE
ENGINEERS, INC.
■
■
STRUCTURAL
DBE ■ SBE
Los Angeles
3951 Medford Street, Los Angeles CA 90063
Tel: 323-729-6098 ▪ Fax: 323-729-6043
e-mail: vca@vcaeng.com
I r v in e
2151 Michelson Dr. # 242, Irvine, CA 92612
T e l: 9 4 9 - 6 7 9 - 0 8 7 0 ▪ Fa x: 9 4 9 - 6 7 9 - 9 3 7 0
www.vcaeng.com
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