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

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Runoff Treatment Control Measure Fact SheetInfiltration TrenchTable IT-3. Design Data Summary Sheet for Infiltration TrenchDesigner:Company:Project:Location:Date:1. Determine Design Water Quality Volumea. Tributary drainage areab. Water Quality Volume2. Determine Maximum Allowable Depth (D m ax ≤ 10 ft)a. Maximum drawdown time (t = 48 hrs)b. Site infiltration rate (I)c. Safety factor (s)d. Gravel porosity (P)e.Dmaxtmax× I=12 × s × P3. Determine Minimum Trench Bottom Surface Area(A min = WQV/D max )Area = ft 2WQV = ft 3t = 48 hrI =in/hrs =P = 0.30D m ax =ftA min = ft 24. Final Design Trench Dimensionsa. Trench length (L)b. Trench width (W)c. Trench depth (D)L =W =D =ftftft5. Observation well diameter Diam. = in.Notes:Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007IT-9
Technical RequirementsSand FilterSand filter in parking lot, City of Sacramento Dept. of UtilitiesDescriptionA sand filter is a two-stage constructed treatmentsystem including a pretreatment sedimentationbasin and a filtration basin containing sand 1 . Thefilter bed is supported by a gravel base whichincludes an underdrain. As stormwater flows intoand through the system, large particles settle out inthe first basin and finer particles and other pollutantsare removed in the second basin. Runoff from largestorm events in excess of the water quality designvolume (WQV) are bypassed around the system.There are several variations of sand filters; this factsheet discusses the Austin Sand Filter.Siting Considerations• Tributary drainage area: Up to 50 acres.• Sizing basis: Water quality volume (WQV) with 48-hourdrawdown. Storm volumes in excess of the WQV must bebypassed.• Hydraulic head: about four feet of hydraulic head is required toachieve design flow through the Austin Sand Filter.• Total filtration basin depth (minimum): 36 inches.Vector Considerations• Potential for mosquitoes due to standing water will be greatlyreduced or eliminated if the sand filter is properly designed,constructed, and maintained.Advantages• Provides effective water quality enhancement through settlingand filtering while requiring relatively small space.• Can be placed above or below ground.• Does not require irrigation or base flow.• Suited for most soil conditions; permeable soils are not needed.• Reduces peak flows during small storm events.POLLUTANT REMOVALEFFECTIVENESSSedimentNutrientsTrashMetals*Bacteria*Oil andGreaseOrganics*HighLowHighHighMediumHighLimitations• Upstream treatment controls may be needed to pretreat and remove sediment from runoff beforeit enters the sand filter. This will prevent or minimize clogging.• Significant head loss through treatment units may limit use on flat sites.• More expensive to construct than other types of treatment control measures.General Maintenance Recommendations (Moderate to High)• Periodically remove debris and sediment from sedimentation basin and surface of filtration basin.• Periodically replace sand layer in filtration basin when filtration capacity is diminished.High*The following are target pollutantsfor Sacramento area: copper; lead;mercury; pathogens; dia zinon; andchlorpyrifosSource: CASQA CaliforniaStormwater BMP Handbook, January20031 Other absorptive filtering media, such as peat, may be used, but this fact sheet focuses on sand.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007SF-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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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 105 and 106: Runoff Reduction Control Measure Fa
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Page 109 and 110: Chapter 6For projects using any of
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Page 119 and 120: Design Data Summary SheetConstructe
Page 141 and 142: Technical RequirementsInfiltration
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Page 177 and 178: Technical RequirementsVegetated Swa
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Page 193 and 194: GlossaryLow Impact Development (LID
Page 195 and 196: GlossaryRegional Stormwater Quality
Page 197 and 198: Appendix ASubmittal RequirementsThe
Page 199 and 200: Sacramento County Supplemental Appl
Page 201: Example Post Construction Stormwate
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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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