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

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Table 3 – Multipliers Based on Ratio of Contributing Pavement to Receiving PavementRatio of Contributing Pavement to Receiving PavementMultiplier< 0.5 1.00>0.5 and 1.0 and 1.5 and
Q = C iAWhere,Q = design flow (cfs)C = Rational Runoff coefficienti = rainfall intensity (in/hr)A = Area (acres)The equation is solved for hydraulic residence time, using various setback lengths and thefollowing assumptions. The setback lengths are that which will provide a 7 minute hydraulicresidence time.Commercial Disconnected Roof Drain Assumptions:W = 8 feet (recommended by local hydrologist as typical average)s = 0.01n = 0.3 (commercial planter strip, will contain some bushes and larger plants)Rooftop C = 0.9 (rational C) (corresponds to 100% imperviousness)T = 7 minutes (standard residence time for treatment)This results in the following setback/travel distance values for commercial sites.Table 4- Minimum Travel Distance for Disconnected Roof Drains inCommercial/Multi-family Development ProjectsArea (maximum roof size) Length (min travel distance) Depth of flow3,500 sq ft 21 feet 0.4 in5,000 sq ft 24 feet 0.5 in7,500 sq ft 28 feet 0.6 in10,000 sq ft 32 feet 0.7 inInterceptor Trees (IT)Interceptor trees can prevent and/or delay water from landing on an impervious surface. Much of theintercepted water runs down along the tree’s leaves and branches and evaporates, or runs down into theroot system. Properly located trees can reduce the effective impervious fraction by diverting rain thatwould otherwise fall on streets and sidewalks. The City of Portland Stormwater Management Manual(2004) and City of San Jose policy apply 100 sq. ft of credit for a deciduous tree and 200 sq. feet for anevergreen tree. Research results published by Q. Xiao (1998, 2000(2), 2003) provides evidence that thiscredit system is appropriate. The number of trees is multiplied by the credit to obtain an area reduced byinterceptor trees. Credits may be applied for existing trees as defined in Interceptor Trees Fact Sheet. Tocalculate the credits allowed for existing interceptor trees, the designer must identify the square footageequal to one half of the tree canopy. The resulting area is considered the area effectively managed by theexisting interceptor trees.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 Appendix D-4 Page 10
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Stormwater Quality Design Manualfor
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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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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 Fact SheetDisconne
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Chapter 6• What are pollutants of
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Chapter 6For projects using any of
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Runoff Treatment Control Measure Fa
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Design Data Summary SheetConstructe
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Technical RequirementsInfiltration
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Technical RequirementsVegetated Swa
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Page 191 and 192: Glossaryexposure of construction ma
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
Page 204 and 205: Typically maintenance agreements an
Page 206 and 207: Example Maintenance Covenant(Sacram
Page 208 and 209: Device in accordance with the maint
Page 210 and 211: [attach]DECLARANT’S ACKNOWLEGEMEN
Page 212 and 213: Recorded at the request of:CITY OF
Page 214 and 215: 9. The obligations herein undertake
Page 216 and 217: EXHIBIT B[Map/Illustration]
Page 218 and 219: City of FolsomThe City of Folsom ow
Page 220 and 221: Appendix D-1: Residential Sites: Ru
Page 222: Form D-1d: Alternative Driveway Des
Page 225 and 226: Form D-2a: Disconnected Pavement Wo
Page 228 and 229: Appendix D-3Runoff Reduction Credit
Page 230 and 231: These tables refer to runoff reduct
Page 232 and 233: Mature TreeShape Canopy (dia.) Heig
Page 234 and 235: Appendix D4LID Credits Background R
Page 236 and 237: unoff from the driveway by 60% whil
Page 238 and 239: The designer must determine how man
Page 240 and 241: Or the ASCE-WEF method (Sacramento)
Page 244 and 245: Using the Effective Area Managed in
Page 246 and 247: SMRC, The Stormwater Manager’s Re
Page 248 and 249: Flow-based control measure design s
Page 250 and 251: 4. Apply the Rational Formula to ca
Page 252 and 253: 5. Enter the capture curve selected
Page 254 and 255: 1.201.000.80STORAGE (in)0.600.4024-
Page 256 and 257: 1.201.000.80STORAGE (in)0.600.4048
Page 258 and 259: Subject: VEGETATED SWALE EXAMPLEPLA
Page 260: PART II:Routing Excess Runoff throu
Page 263 and 264: 4. Design the OutletThe outlet shou
Page 265 and 266: Exhibit 1Water Quality Orifice Outl
Page 267 and 268: 3. Calculate Planter Surface Area A
Page 269 and 270: • Bottom slopes of 0.01 to 0.05%
Page 271: Appendix HDrainage Design and Storm
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