Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

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Runoff Treatment Control Measure Fact SheetWater Quality Detention BasinsTable DB-2. Dry Weather Design FlowsBASINAREA(ACRES)DRYWEATHERFLOW(MGAL/WK)LAND USEMGAL/WK(PER ACSHED)CFS (PERAC SHED)AC-FT/DAY(PER ACSHED)Summary of City of Sacramento Drainage Sump Stations Used33 684 1.07 Residential/Commercial 0.0016 0.000354 0.000734 687 1.25 Residential 0.0018 0.000398 0.000863 481 1.71 Residential 0.0036 0.000796 0.001666 443 1.72 Industrial 0.0039 0.000862 0.001767 896 3.10 Residential/Commercial 0.0035 0.000774 0.001569 1,115 4.50 Residential 0.0040 0.000884 0.001896 1,308 1.33 Mix 0.0010 0.000221 0.0004116 197 0.30 Industrial 0.0015 0.000332 0.0007129 1,356 3.53 Mix (mostly residential) 0.0026 0.000575 0.0011132 2,044 8.83 Residential 0.0043 0.000950 0.0019151 1,058 3.24 Mix 0.0031 0.000685 0.0013152 1,479 13.60 Mix 0.0092 0.002034 0.0040154 662 0.92 Commercial/Industrial 0.0014 0.000309 0.0006159 573 1.48 Residential/Industrial 0.0026 0.000575 0.0011Source of information for basins 33, 66, 67, 69, 116, 151, 152, and 159 is from the City of Sacramento Illicit ConnectionProgram Field Screening Report Phase 2, January 1997. Flow data from 1993, 1994, 1995, and 1996.Source of information for basins 34, 63, 96, 129, 132, and 154 is from the City of Sacramento Illicit Connection Program FieldScreening Report, July 1995. Flow data from 1994.Residential and Residential/Other33 684 1.07 Residential / Commercial 0.0016 0.000354 0.000734 687 1.25 Residential 0.0018 0.000398 0.000863 481 1.71 Residential 0.0036 0.000796 0.001667 896 3.10 Residential/Commercial 0.0035 0.000774 0.001569 1,115 4.50 Residential 0.0040 0.000884 0.0018129 1,356 3.53 Mix (Mostly residential) 0.0026 0.000575 0.0011132 2,044 8.83 Residential 0.0043 0.000950 0.0019159 573 1.48 Residential/Industrial 0.0026 0.000575 0.0011Average 0.003000 0.000663 0.001313Median 0.003050 0.000674 0.001300Commercial / Industrial / Mix66 443 1.72 Industrial 0.0039 0.00086 0.001796 1,308 1.33 Mix 0.0010 0.00022 0.0004116 197 0.30 Industrial 0.0015 0.00033 0.0007151 1,058 3.24 Mix 0.0031 0.00069 0.0013152 1,479 13.60 Mix 0.0092 0.00203 0.0040154 662 0.92 Commercial/Industrial 0.0014 0.00031 0.0006Average 0.003350 0.000740 0.001450Median 0.002300 0.000508 0.001000Residential34 687 1.25 Residential 0.0018 0.000398 0.000863 481 1.71 Residential 0.0036 0.000796 0.001669 1,115 4.50 Residential 0.0040 0.000884 0.0018132 2,044 8.83 Residential 0.0043 0.000950 0.0019Average 0.003425 0.000757 0.001525Median 0.003800 0.000839 0.001700Stormwater Quality Design Manual for the Sacramento and South Placer RegionsDB-8 May 2007
Runoff Treatment Control Measure Fact SheetWater Quality Detention BasinsDesign Criteria: Design using the following criteria:• The gravel media - 1” to 1-1/2” in size. The porosity of the gravel bed is approximately 0.4• The bed depth – d = 2 feet (The depth of media is selected by allowing consideration for bottomsediment buildup and rooting requirements of desired vegetation.)• The design porosity of the gravel bed - ε = 0.3• The effective hydraulic conductivity shall be less than 95,000 ft/day.• Nominal hydraulic detention time through the gravel bed, τ = 2 days.Surface Area = SA = L W = (τ Q) / (d ε) = (2 days)Q/(2 feet)(0.3)(86400 sec/day)where Q= dry weather design flow rate (cfs)Step 8 - Prepare a Landscaping PlanRetain a certified landscape architect or wetland specialist to prepare a landscaping plan that includes:• a planting layout showing what species to plant where• plant sizes (e.g. seed, plug, 1-gallon container, etc.)• planting techniques• plant spacing• soil amendments• hydroseed specifications• Irrigation specifications (which must conform to applicable local regulations)Consider the following when choosing plants:• Do not plant trees at the base of any access ramps, around any inlet, outlet or culvert, or within 5to 10 feet of a concrete structure or channel.• Cluster trees and shrubs when possible to make mowing of basin easier.• Trees may not be allowed on the basin floor (check with local permitting agency).• Use native plants.• Choose plants that are adapted to the site conditions, including the expected degree ofinundation/soil moisture.• Incorporate plants known to improve water quality.• Where possible, specify an array of plant types, including emergent species (in channels/ponds),herbaceous species, and trees and shrubs (along the outer borders). This results in a more naturalsystem and enhances the aesthetic and wildlife value. However, shrubs and trees should not beused for clay-lined permanent ponds or basins.See Tables DB-3 and DB-4 for a list of suitable plants for different degrees of inundation/soil saturation.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007DB-9
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Stormwater Quality Design Manualfor
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Stormwater Quality Design Manual wa
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Table of contentsOutdoor Work Areas
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Table of contentsSF-1.SF-2.SF-3.SF-
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Other Development Community Reviewe
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1 IntroductionPurposeThis Stormwate
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IntroductionIn July 2003, the permi
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IntroductionFor redevelopment proje
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Introduction• The Appendices prov
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2 An Integrated Approach toEffectiv
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Integrated ApproachIt is also helpf
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Integrated ApproachPut landscaping
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Integrated Approachfactors will be
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Chapter 3Figure 3-1. Process for Ad
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Chapter 3runoff reduction first (ev
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Chapter 3As the name implies (and a
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Chapter 3Step 9: Establish Long Ter
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Chapter 4Source Control Fact Sheets
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Source Control Measure Fact SheetSt
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Source Control Measure Fact SheetFu
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Source Control Measure Fact SheetLo
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Source Control Measure Fact SheetOu
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5 Runoff Reduction Control Measures
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Runoff Reduction Control MeasuresDe
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Runoff Reduction Control Measures
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Runoff Reduction Fact SheetDisconne
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Technical RequirementsVegetated Swa
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Runoff Treatment Control Measure Fa
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Glossaryexposure of construction ma
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GlossaryLow Impact Development (LID
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GlossaryRegional Stormwater Quality
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Appendix ASubmittal RequirementsThe
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Sacramento County Supplemental Appl
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Example Post Construction Stormwate
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Typically maintenance agreements an
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Example Maintenance Covenant(Sacram
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Device in accordance with the maint
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[attach]DECLARANT’S ACKNOWLEGEMEN
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Recorded at the request of:CITY OF
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9. The obligations herein undertake
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EXHIBIT B[Map/Illustration]
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City of FolsomThe City of Folsom ow
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Appendix D-1: Residential Sites: Ru
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Form D-1d: Alternative Driveway Des
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Form D-2a: Disconnected Pavement Wo
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Appendix D-3Runoff Reduction Credit
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These tables refer to runoff reduct
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Mature TreeShape Canopy (dia.) Heig
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Appendix D4LID Credits Background R
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unoff from the driveway by 60% whil
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The designer must determine how man
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Or the ASCE-WEF method (Sacramento)
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Table 3 - Multipliers Based on Rati
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Using the Effective Area Managed in
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SMRC, The Stormwater Manager’s Re
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Flow-based control measure design s
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4. Apply the Rational Formula to ca
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5. Enter the capture curve selected
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1.201.000.80STORAGE (in)0.600.4024-
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1.201.000.80STORAGE (in)0.600.4048
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Subject: VEGETATED SWALE EXAMPLEPLA
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PART II:Routing Excess Runoff throu
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4. Design the OutletThe outlet shou
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Exhibit 1Water Quality Orifice Outl
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3. Calculate Planter Surface Area A
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• Bottom slopes of 0.01 to 0.05%
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Appendix HDrainage Design and Storm
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