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

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Technical RequirementsInfiltration BasinStep 3 – Calculate minimum surface area of Infiltration Basin bottom (Amin)A min= WQV/D maxwhereA min = minimum area required (ft 2 )D max = maximum allowable depth (ft)Step 4 – Design forebay settling basinThe forebay provides a zone for removal of course sediment by sedimentation. Design the forebayevolumeto be five (5) to ten (10) percent of the WQV. Separate the forebay from the basin by a berm orsimilar feature. Provide an outlet pipe connecting the bottom of the forebay and the basin and size it toallow the forebay volume to drain within 45 minutes.Step 5 – Design embankmentsInterior slopes (H:V) should be no steeper than 4:1 and exterior slopes no steeper than 3:1. Flatter slopesare preferable.Step 6 – Design Maintenance AccessProvide for all-weather access for maintenance vehicles to the bottom and outlet works. Maximum gradesof access ramps should be ten (10) percent and minimum width will vary according to local permittingagency requirements, but usually between 15-20 feet. Pave ramps with concrete that is colored to blendwith surroundings.Step 7 – Design Security FencingTo protect habitat and for safety reasons, provide aesthetic security fencing approved by the permittingagency around the infiltration basin, except when specifically waived by the permitting agency.Step 8 – Design BypassProvide for bypass or overflow of runoff volumes in excess of the WQV. Provide spillway or overflowstructures, as applicable (see Figure IB-1).Step 9 – Design Relief DrainProvide 4-inch diameter perforated plastic relief underdrain with a valved outlet to allow removal ofstanding water in the event of loss of soil infiltration capacity. Cutoff collars are recommended alongdrain pipes running under the embankment at 10 to 20 feet intervals to prevent the water from pipingthrough the fill. The portion of the relief drain that is under the embankement should not be permeable.Step 10 – Select VegetationPlant basin bottoms, berms, and side slopes with native grasses or with irrigated turf. Vegetation provideserosion protection and filters sediment out of the runoff..Step 11 – Design irrigation systemProvide an irrigation system to maintain viability of vegetation (short-term establishment and long-term needs).Stormwater Quality Design Manual for the Sacramento and South Placer RegionsIB-4 May 2007
Technical RequirementsInfiltration BasinConstruction Considerations• If possible, stabilize the entire tributary area to the infiltration basin before construction begins. Ifthis is not possible, divert flow around the basin to protect it from sediment loads duringconstruction. If sediment does enter the facility during construction, the contractor will berequired to remove soil from the basin floor after the entire site has been stabilized, to thesatisfaction of the permitting agency inspector.• Construct basin using equipment with extra wide, low-pressure tires. Prevent construction trafficfrom entering basin.• Ensure that final grading produces a level basin bottom without low spots or depressions.• After final grading, deep till the basin bottom.• Once construction is complete, stabilize the entire tributary area to the basin and the vegetationwithin the basin itself, before allowing runoff to enter the infiltration facility.• Divert runoff (other than necessary irrigation) during the period of basin vegetationestablishment.• Inspect frequently during vegetation establishment, and repair, seed, or re-plant damaged areasimmediately.Embankment (if required)InletFlat Basin Floor with VegetationRiprapOutfallProtectionEmergency SpillwayRelief Underdrain(Optional)PlanValveStormwater StorageInletSectionSource: Schueler, 1987Figure IB-1. Infiltration BasinStormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007IB-5
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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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Source Control Measure Fact SheetWa
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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 Control Measure Fa
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Runoff Reduction Fact SheetDisconne
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Page 93 and 94: Runoff Reduction Control Measure Fa
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Page 119 and 120: Design Data Summary SheetConstructe
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Page 177 and 178: Technical RequirementsVegetated Swa
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Page 193 and 194: 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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