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

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Technical RequirementsInfiltration BasinLong-Term MaintenanceThe local permitting agencies in the Sacramento and South Placer areas require execution of amaintenance agreement or permit with the property owner for projects including an infiltration basin.Check with the local permitting agency about the timing for execution of the agreement. Such agreementswill typically include requirements such as those outlined in Table IB-2. The property owner or his/herdesignee will be responsible for compliance. See Appendix B for additional information aboutmaintenance requirements and sample agreement language.Table IB-2. Inspection and Maintenance Recommendations for Infiltration BasinsActivityMonitor infiltration rate in basin after storm events by recording thedrop in water depth versus time using a calibrated rod or staff gauge.If drawdown time is observed to have increased significantly over thedesign drawdown time, clean, re-grade, and till basin bottom torestore infiltrative capacity. This maintenance activity is expensiveand the need for it can be minimized by preventing upstream erosion.Inspect basin to identify potential problems such as erosion of thebasin side slopes and invert, standing water, trash and debris, andsediment accumulation.If erosion is occurring within the basin, stabilize with erosion controlmulch or mat and seed or re-vegetate immediately.Monitor health of vegetation and replace as needed.Trim vegetation to prevent the establishment of woody vegetation andfor aesthetic and vector control reasons.Remove litter and debris from infiltration basin area.Remove accumulated sediment and re-grade when the accumulatedsediment volume exceeds ten (10) percent of the basin volume. Note:scarification or other activities creating disturbance should only beperformed when there are actual signs of clogging, rather than on aroutine basis.Reconstruct or replace the control measure when it is no longerfunctioning properly.ScheduleSeveral times during first year. Thereafter atthe beginning and end of the wet season.Additional monitoring after periods of heavyrunoff is recommended.As neededAt beginning and end of the wet season.Additional inspections after periods of heavyrunoff are desirable.As neededRoutinely monitor vegetationAt the beginning and end of the wet seasonAs neededAs required for both forebay and basinSee projected lifespan in Appendix B forinformational purposes.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsIB-6 May 2007
Technical RequirementsInfiltration BasinTable IB-3. Design Data Summary Sheet for Infiltration BasinDesigner:Company:Project:Location:Date:1. Determine Design Water Quality Volumea. Tributary drainage areab. Water Quality VolumeArea = ft 2WQV = ft 32. Determine Maximum Allowable Depth (D max ≤ 10 ft)a. Maximum drawdown time (t = 48 hrs)b. Site infiltration rate (I)c. Safety factor (s)d.Dmaxtmax× I=12 × st = 48 hrI =s =D max =3. Determine Minimum Allowable Basin Bottom Area(A min = WQV/D max ) A min = in/hr4. Forebay Volume (VFB) VFB = ft 35. Bypass/Outlet Control Structure (Check type)in/hrft Overflow Structure Spillway6. Vegetation (Check type used or describe “Other”) Native grasses Irrigated turf grass OtherNotes:Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007IB-7
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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 177 and 178: Technical RequirementsVegetated Swa
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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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