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

More documents

Recommendations

Info

Technical RequirementsSand FilterHIGH FLOWDIVERSIONFILTRATIONBASINPERFORATED DRAINPIPESEDIMENTATIONBASINFILTERED OUTFLOWNOTE: SEDIMENTATION POND MAY MAY BEUSED BE USED IN LIEU IN LIEU OF CONCRETE OF CONCRETE BASIN. BASIN. FILTRATION BASIN MAY BE BE BUILTDIRECTLY INTO GROUND OVER AN AN IMPERVIOUS GEOMEMBRANE IF SOILCONDITIONS IF SOIL CONDITIONS ALLOW. ALLOW.PLANNOT TO SCALERIP RAPWIER TO PROVIDEUNIFORM DISTRIBUTIONSAND BEDPERFORATED RISERWITH TRASH RACKSEDIMENT TRAP WITHUNDERDRAIN (OPTIONAL)VALVEFILTER SAND BED BEDSEE FIGURE XXMAX WATER DEPTH@ WQVSource: Austin, TexasELEVATIONNOT TO SCALEFigure SF-1. Sand Filter Configuration (Austin Sand Filter)Stormwater Quality Design Manual for the Sacramento and South Placer RegionsSF-4 May 2007
Technical RequirementsSand FilterDesign Procedure – Sedimentation BasinThe design procedure and application of design criteria for the Austin Sand Filter sedimentation basin areoutlined in the following steps. This procedure is for full sedimentation design. Partial sedimentationdevices are not recommended due to high maintenance concerns.Step 1 – Determine Water Quality Volume (WQV)Using the Appendix E in this Design Manual, determine thetributary drainage area and stormwater quality design volume(WQV) for 48-hour drawdown.Step 2 – Determine Sedimentation Basin Volume (Vsb)The volume of the sedimentation basin must be ≥ WQVV sb = WQV (minimum)Use the Design DataSummary Sheet (TableSF-5) to record designinformation for thepermitting agency’s review.Step 3 – Determine Sedimentation Basin Water Depth (d sb )The allowable water depth in the sedimentation basin will be governed by the available hydraulic head,which will be based on the difference in elevation between the sedimentation basin inlet and the filltrationbasin outlet. The design d sb value should be ≥ 3 ft and ≤ 10 ft. Select a design depth in the allowable rangethat yields the required V sb given any footprint area constraints.Step 4 – Determine Sedimentation Basin Area (Asb)A sb = V sb / d sbStep 5 – Determine Sedimentation Basin ShapeDetermine overall length (L sb ) and width (W sb ) dimensions to yield the A sb for the basin, given anyfootprint area constraints.A sb = L sb x W sbThe length-to-width ratio should be at least 2:1. If necessary, provide internal baffling to achieve this ratioand to mitigate short-circuiting and/or dead storage problemsIf the basin is not rectangular, shape the basin with a gradual expansion from the inlet and a gradualcontraction toward the outlet. Design the basin to maximize the distance from the inlet (near whereheavier sediment will be deposited) to the outlet structure. This configuration improves basin performanceand reduces maintenance requirements.Step 6 – Determine Inlet/Outlet DesignDesign the inlet structure to convey the water quality volume to the unit and bypass flows in excess ofthis volume directly to the downstream storm drain system. Provide energy dissipation at the inlet tomaintain quiescent conditions needed for effective sedimentation; keep inlet velocities at three (3) feet persecond or less.The outlet structure conveys the water quality volume from the sedimentation basin to the filtration basinand should be a perforated riser pipe equipped with a trash rack to prevent clogging. Trash racks alloweasy access for inspecting and cleaning outlet orifices. Size trash racks to prevent clogging of the outletwithout restricting the hydraulic capacity of the outlet control orifices.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007SF-5
Page 1 and 2:
Stormwater Quality Design Manualfor
Page 3 and 4:
Stormwater Quality Design Manual wa
Page 5 and 6:
Table of contentsOutdoor Work Areas
Page 7 and 8:
Table of contentsSF-1.SF-2.SF-3.SF-
Page 9 and 10:
Other Development Community Reviewe
Page 11 and 12:
1 IntroductionPurposeThis Stormwate
Page 13 and 14:
IntroductionIn July 2003, the permi
Page 15 and 16:
IntroductionFor redevelopment proje
Page 17 and 18:
Introduction• The Appendices prov
Page 19 and 20:
2 An Integrated Approach toEffectiv
Page 21 and 22:
Integrated ApproachIt is also helpf
Page 23 and 24:
Integrated ApproachPut landscaping
Page 25 and 26:
Integrated Approachfactors will be
Page 27 and 28:
Chapter 3Figure 3-1. Process for Ad
Page 29 and 30:
Chapter 3runoff reduction first (ev
Page 31 and 32:
Chapter 3As the name implies (and a
Page 33 and 34:
Chapter 3Step 9: Establish Long Ter
Page 35 and 36:
Chapter 4Source Control Fact Sheets
Page 37 and 38:
Source Control Measure Fact SheetSt
Page 39 and 40:
Source Control Measure Fact SheetFu
Page 41 and 42:
Source Control Measure Fact SheetLo
Page 43 and 44:
Source Control Measure Fact SheetOu
Page 45 and 46:
Source Control Measure Fact SheetOu
Page 47 and 48:
Source Control Measure Fact SheetWa
Page 49 and 50:
Source Control Measure Fact SheetWa
Page 51 and 52:
5 Runoff Reduction Control Measures
Page 53 and 54:
Runoff Reduction Control MeasuresDe
Page 55 and 56:
Runoff Reduction Control Measures
Page 57 and 58:
Runoff Reduction Control Measure Fa
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Runoff Reduction Fact SheetDisconne
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Chapter 6• What are pollutants of
Page 109 and 110: Chapter 6For projects using any of
Page 111 and 112: Runoff Treatment Control Measure Fa
Page 119 and 120: Design Data Summary SheetConstructe
Page 141 and 142: Technical RequirementsInfiltration
Page 157 and 158: Technical RequirementsSand FilterSa
Page 159: Technical RequirementsSand FilterDe
Page 163 and 164: Technical RequirementsSand FilterSt
Page 165 and 166: Technical RequirementsSand FilterTa
Page 167 and 168: Technical RequirementsSand FilterLo
Page 177 and 178: Technical RequirementsVegetated Swa
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 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 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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?