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

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Design Data Summary SheetConstructed Wetland BasinDesign Data Summary Sheet for Constructed Wetland Basin (Page 2 of 2)Project:6. Outlet Worksa. Outlet Type (check one) Single Orifice Multi-orifice Plate Perforated Pipe Otherb. Depth of water above bottom orifice (D WQV )c. Single Orifice Outlet1) Total Area2) Diameter (or L x W)d. Multiple Orifice Outlet1) Area per Row of Perforations2) Perforation Diameter (2-inch max.)3) No. of Perforations (columns) per Row4) No. of Rows (4-inch spacing)5) Total Orifice Area(Area per Row) x (Number of Rows)Depth =A = in 2D =inA = in 2Diam =inPerforations =Rows =Area = in 2ft7. Basin Shapea. Length-Width Ratio (2:1 min.) Ratio = L:W8. Embankment Side Slopea. Interior Side Slope (4:1 or steeper)Int. Side Slope = L:Wb. Exterior Side Slope (3:1)Ext. Side Slope = L:W9. Maintenance Access Rampa. Slope (10% maximum)Slope = %b. Width (15 to 20 feet)Width =ft10.Vegetation (describe)Native GrassesIrrigated TurfEmergent Aquatic Plants (specify type / density)*OtherNotes:Stormwater Quality Design Manual for the Sacramento and South Placer RegionsCWB-10 May 2007
Runoff Treatment Control Measure Fact SheetWater Quality Detention BasinsSource: County of Sacramento, Department of WaterResourcesDescriptionA stormwater quality detention basin (also called awater quality basin or extended detention basin) isdesigned to hold stormwater runoff from smallstorms and the initial runoff (“first flush”) fromlarger storms for a regulated downstream release.Pollutants are removed from stormwater throughgravitational settling and biological processesdepending on the type of basin. There are three typesof water quality detention basins:• Wet stormwater quality detention basins (wetbasins) that store a permanent pond of water• Dry extended stormwater quality detentionbasins (dry-extended basins) that temporarilystore stormwater runoff• Combination (wet/dry) stormwater qualitydetention basins (combination basins) thatcombine the wet and dry basin treatmentsystemsStormwater quality basins must incorporate featuresthat treat dry-weather flows (such as irrigationrunoff). Wet basins and combination basins treat thedry weather flows within the permanent pond (micropool); however, dry basin designs must include anadditional feature such as a submerged gravel bed or other agency approved feature.Siting Considerations• Drainage area: typically greater than 20 acres• Longitudinal bottom slope: At least 2% in dry basins.Can undulate in wet basins.• Side slopes: 3:1 or flatter for basin; 3:1 or steeper forpermanent ponds.• Impermeable liners may be required in areas withhigh groundwater.Vector Considerations• Potential for mosquitoes due to standing water willbe greatly reduced or eliminated if the basins andassociated features are properly designed,constructed, operated and maintained.• Permanent ponds shall be stocked with mosquito fishfor vector control.POLLUTANT REMOVAL EFFECTIVENESSDry basinWet basinSediment Medium HighNutrients Low MediumTrash High HighMetals* Medium HighBacteria* Medium HighOil & Grease Medium HighOrganics* Medium High*Target Pollutant for Sacramento AreaSource: CASQA California Stormwater BMP Handbook,January 2003Advantages• May provide both stormwater quality treatment and flood control if designed for flood flows.• Mitigate increased volume and flow impacts caused by development.• If properly designed, constructed, and maintained, have substantial aesthetic and recreationalvalue and provide wildlife habitat.• Viewed as a public amenity when integrated into a park or open space setting and properlydesigned and landscaped.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007DB-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 SheetWa
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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 Treatment Control Measure Fa
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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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