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

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Subject: VEGETATED SWALE EXAMPLEPLANTER#3PLANTER#4SWALE #1SWALE #2KeyInletOutletPipeSheet flowSite: 8 Acre Professional/Commercial DevelopmentPART I:(Used Table VS- 3 - The Design data Summary Sheet for Vegetated Swale for necessary calculationsfor Swale #1)1. Design Flow: WQF = CiA WQF = 0.486 cfsa. i = Rainfall Intensity = 0.18 in/hr i = 0.18 in/hrb. C = Runoff Coefficient C = 0.9c. A = Tributary area for Swale #1 A = 3 acres2. Swale Geometrya. Swale Bottom Width (b) b = 5 ftb. Side Slope (Z) Z = 3
3. Depth of flow (d) at WQF (3” – 5” with Manning’s n = 0.20) d = ‘y 1 ’ ft.(Description on how to calculate d is explained below)A = by + Zy 2 (eqn 1)R = A/P = [ ( by + Zy 2 ) / (b + 2y√ (1 + Z 2 ))] (eqn 2)Q = (1.49/n) (by + Zy 2 ) [ ( by + Zy 2 ) / (b + 2y√ (1 + Z 2 ))] 2/3 (s) 1/2 (eqn 3)Using Eqn. 3:0.486 = (1.49/.2) (5y + 3y 2 ) [(5y + 3y 2 ) / (5 + 2y√10)] 2/3 (.01) 1/2Trial & ErrorY.35 => 7.45(2.1175)(.44169)(.1) = .696.29 => 7.45(1.7023)(.3959)(.1) = .502.28 => 7.45(1.6352)(.3878)(.1) = .472.282 => 7.45(1.64857)(.38945)(.1) = .478.285 ft. => 7.45(1.668675)(.39186)(.1) = .487 cfsy 1 = Depth of WQF = 0.285 ft.4. Design Slopea. s = 1% minimum without underdrains; 4% maximum s = 1%without grade controls5. Design Flow Velocity (Manning’s n = 0.20) V = 0.29 ft/secVelocity = Q/A = (using eqn. 3&1) = 0.486cfs / 1.67ft. = 0.29 ft/sec.6. Contact time (t c = 7 minutes minimum) t c = 7 minutes7. Design LengthL = (t c ) x (flow velocity) x 60L = 7min x (.291ft/sec) x 60 = 122.22 ftL = 122.32 ft
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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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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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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 RequirementsSand FilterSa
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Technical RequirementsSand FilterTa
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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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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 242 and 243: Table 3 - Multipliers Based on Rati
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 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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