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

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Runoff Treatment Control Measure Fact SheetWater Quality Detention BasinsDesign Data Summary Sheet for Water Quality Detention BasinProject:6. Outleta. Outlet Type:b. Drawdown Time: Time = Hours7. Basin Shapea. Length-Width Ratio (2:1 min.) Ratio = L:W8. Embankment Side Slopea. Interior Side Slope (4:1or flatter)b. Exterior Side Slope (3:1or flatter)Int. Side Slope =Ext. Side Slope =L:WL:W9. Maintenance Access Rampa. Slope (10% maximum)b. Width (15 to 20 feet)Slope = %Width =ft10.Vegetation (describe)Native GrassesIrrigated TurfEmergent Aquatic Plants (specify type / density)*OtherNotes:Stormwater Quality Design Manual for the Sacramento and South Placer RegionsDB-20 May 2007
Technical RequirementsInfiltration BasinDescriptionAn infiltration basin is a shallow earthen basinconstructed in naturally pervious soils (usuallyType A or B) and designed for infiltratingstormwater. An infiltration basin functions byretaining runoff and allowing it to percolate into theunderlying native soils and into the groundwatertable over a specified drawdown period. Thebottoms and side slopes of infiltration basins aretypically vegetated with dryland grasses or irrigatedturf grass.Photo credit: Wisconsin DNRSiting Considerations• Tributary drainage area: Up to 50 acres.• Soil Infiltration Rate: 0.5-2.0 in/hr (permeability test required).Soils with higher infiltration rates require pretreatment device.• Depth to groundwater: ≥10 ft from basin bottom.• Existing groundwater contamination.• Setback requirements: 100 ft from wells; 20 ft downslope and 100ft upslope from foundations.• Topography: Not appropriate on fill or steep slopes.Vector Considerations• Potential for mosquitoes due to standing water will be greatlyreduced or eliminated if the basin is properly designed,constructed, and operated to maintain its infiltration capacity anddrawdown time.POLLUTANT REMOVALEFFECTIVENESSSedimentNutrientsTrashMetals*Bacteria*Oil and GreaseOrganics*HighHighHighHighHighHighHigh*The following are target pollutants forSacramento area: copper; lead; mercury;pathogens; diazinon; and chlorpyrifosSource: CASQA California StormwaterBMP Handbook, January 2003Advantages• Reduces or eliminates stormwater discharge to surface waters during most storm events• Reduces peak flows during small storm events.• Can be incorporated into site landscape features or multi-use facilities such as parks or athleticfields.Limitations• Not appropriate for areas with slowly permeable soils, high groundwater or existing groundwatercontamination.• Not appropriate for industrial sites or locations where spills may occur.• Must be protected from high sediment loads. Once clogged with sediment, restoration of basininfiltration capacity may be difficult.General Maintenance Recommendations (Low to Moderate)• Maintain vegetation as in any landscaped area.• Periodically remove debris and sediment from basin floor.• Repair/replace vegetation as necessary to maintain desired cover.• Check and record drawdown time during and after major storm events to document infiltrationrates.• Remove sediment and/or scarify basin bottom to restore infiltration capacity when maximumdrawdown time for WQV is exceeded.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007IB-1
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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 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 89 and 90: Runoff Reduction Control Measure Fa
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Page 177 and 178: Technical RequirementsVegetated Swa
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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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Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

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