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Calculating the WQCV and Volume Reduction Chapter 3 1. Level 1. The primary intent is to direct the runoff from impervious surfaces to flow over grasscovered areas and/or permeable pavement, and to provide sufficient travel time to facilitate the removal of suspended solids before runoff leaves the site, enters a curb and gutter system, or enters another stormwater collection system. Thus, at Level 1, to the extent practical, impervious surfaces are designed to drain over grass buffer strips or other pervious surfaces before reaching a stormwater conveyance system. 2. Level 2. As an enhancement to Level 1, Level 2 replaces solid street curb and gutter systems with no curb or slotted curbing, low-velocity grass-lined swales and pervious street shoulders, including pervious rock-lined swales. Conveyance systems and storm sewer inlets will still be needed to collect runoff at downstream intersections and crossings where stormwater flow rates exceed the capacity of the swales. Small culverts will be needed at street crossings and at individual driveways until inlets are provided to convey the flow to storm sewer. The primary difference between Levels 1 and 2 is that for Level 2, a pervious conveyance system (i.e., swales) is provided rather than storm sewer. Disconnection of roof drains and other lot-level impervious areas is essentially the same for both Levels 1 and 2. Figure 3-7 and Figure 3-8 can be used to estimate effective imperviousness for Level 1 and Level 2. Because rainfall intensity varies with return interval, the effective imperviousness also varies, as demonstrated by the separate curves for the 2-, 10- and 100-year return intervals (see Figure 3-7 and Figure 3-8). The effective imperviousness determined from Figure 3-7 and Figure 3-8 can be used as input for calculation of the WQCV, as the basis for looking up runoff coefficients based on imperviousness in the Runoff chapter in Volume 1 and for calculation of empirical storage volumes in accordance with the Storage chapter in Volume 2. Figure 3-7 and Figure 3-8 are intended for use at the planning level when specifics of the D and R relationships in CUHP are not yet well established. It is notable that the reductions in effective imperviousness shown in Figure 3-7 and Figure 3-8 are relatively modest, ranging from little to no benefit for large events up to approximately 12% for Level 2 for a total imperviousness of roughly 50% (reduced to about 38% for the 2-year event). This is a function of the D and R relationships defined in CUHP. When site-level details are still in conceptual stages, the use of default D and R values for Levels 1 and 2 provides a tool for a master planning/watershed level assessment of effects of disconnected impervious area. At a more advanced stage of design, when site-specific disconnected areas, receiving pervious areas, flow paths, and other design details are available, the site-level methods in Section 4.3 can be used to better quantify volume reduction, and results will typically show greater reductions in effective imperviousness for aggressive LID implementation than reflected in the default D and R relationships used to create Figure 3-7 and Figure 3- 8. Even so, it is unlikely that conveyance-based BMPs alone will provide adequate pollutant removal and volume reduction for most project sites, and a storage-based BMP (i.e., WQCV) will also be required. 3-12 Urban Drainage and Flood Control District August 2011 Urban Storm Drainage Criteria Manual Volume 3
Chapter 3 Calculating the WQCV and Volume Reduction 100% 90% 80% Effective Imperviousness 70% 60% 50% 40% 30% 20% 10% 0% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Total Imperviousness Directly Connected 2-year Level 1 10-year Level 1 100-year Level 1 Figure 3-7. Effective Imperviousness Adjustments for Level 1 MDCIA August 2011 Urban Drainage and Flood Control District 3-13 Urban Storm Drainage Criteria Manual Volume 3
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Urban Storm Drainage Criteria Manua
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Table of Contents Urban Storm Drain
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Disclaimer Attention all persons us
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Preface 1.0 Acknowledgements The Ur
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Preface 2.0 Purpose Volume 3 of the
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Preface • Glossary: A glossary is
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Preface fps ft FHWA GB GS H:V HSG F
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Chapter 1 Stormwater Management and
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Stormwater Management and Planning
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Page 26 and 27: Stormwater Management and Planning
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Page 109 and 110: Grass Buffer T-1 4. Buffer Slope: T
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Page 118 and 119: T-2 Grass Swale • Provide access
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T-3 Bioretention Site Selection Bio
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T-3 Bioretention Table B-1. Class 1
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Bioretention T-3 Pipe Diameter Tabl
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Bioretention T-3 6. Inlet/Outlet Co
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Bioretention T-3 Table B-6. Native
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Bioretention T-3 Figure B-1 - Typic
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Bioretention T-3 November 2010 Urba
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Bioretention T-3 Figure B-2. Geomem
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Bioretention T-3 Construction Examp
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Bioretention T-3 Design Example The
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Bioretention T-3 Design Procedure F
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T-4 Green Roof reduction benefits o
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T-4 Green Roof Figure GR-1. Typical
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Green Roof T-4 6. Planting Method:
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Green Roof T-4 Additional Design Gu
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Green Roof T-4 Colorado Examples Th
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Extended Detention Basin (EDB) T-5
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T-5 Extended Detention Basin (EDB)
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T-6 Sand Filter adjacent structures
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T-6 Sand Filter 5. Impermeable Geom
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T-6 Sand Filter Figure SF-1. Sand F
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T-6 Sand Filter Design Examples The
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Retention Pond T-7 Description A re
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Retention Pond T-7 H = depth of sur
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Retention Pond T-7 Aesthetic Design
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Retention Pond T-7 Design Example F
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Retention Pond T-7 Design Procedure
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Retention Pond T-7 References Bedie
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T-8 Constructed Wetland Pond be des
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T-8 Constructed Wetland Pond Figure
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T-8 Constructed Wetland Pond Design
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T-8 Constructed Wetland Pond Refere
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T-9 Constructed Wetland Channel A c
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T-9 Constructed Wetland Channel Fig
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Permeable Pavement Systems T-10 Des
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Permeable Pavement Systems T-10 •
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Permeable Pavement Systems T-10 inf
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Permeable Pavement Systems T-10 3.
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Permeable Pavement Systems T-10 Fig
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Permeable Pavement Systems T-10 Tab
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Permeable Pavement Systems T-10 con
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Permeable Pavement Systems T-10 No-
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Permeable Pavement Systems T-10 Des
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Permeable Interlocking Concrete Pav
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Concrete Grid Pavement T-10.2 Note:
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Pervious Concrete T-10.3 This BMP F
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T-10.4 Porous Gravel Designing for
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T-10.5 Reinforced Grass Designing f
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T-11 Underground BMPs Underground B
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T-11 Underground BMPs • Traffic L
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T-11 Underground BMPs Design Proced
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T-11 Underground BMPs • Wisconsin
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T-11 Underground BMPs For these rea
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T-12 Outlet Structures Orifice Plat
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T-12 Outlet Structures 100 A t / A
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T-12 Outlet Structures Table OS-3a.
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T-12 Outlet Structures Outlet Geome
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T-12 Outlet Structures Figure OS-2.
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Chapter 5 Source Control BMPs Conte
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Source Control BMPs Chapter 5 Table
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Source Control BMPs Chapter 5 • P
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Source Control BMPs Chapter 5 • S
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Source Control BMPs Chapter 5 5.0 R
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S-1 Covering Outdoor Storage and Ha
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S-2 Spill Prevention, Containment a
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S-2 Spill Prevention, Containment a
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S-3 Disposal of Household Waste •
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S-3 Disposal of Household Waste •
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S-4 Illicit Discharge Controls •
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Good Housekeeping S-5 Description G
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Good Housekeeping S-5 purchase orde
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Vehicle Maintenance, Fueling and St
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Vehicle Maintenance, Fueling and St
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S-8 Use of Pesticides, Herbicides a
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S-8 Use of Pesticides, Herbicides a
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Landscape Maintenance S-9 Descripti
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Landscape Maintenance S-9 • When
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Landscape Maintenance S-9 • Maint
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S-10 Snow and Ice Management o o Di
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S-10 Snow and Ice Management • Do
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S-11 Street Sweeping and Cleaning a
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S-12 Storm Sewer System Cleaning Fr
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BMP Maintenance Chapter 6 party res
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BMP Maintenance Chapter 6 with comm
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BMP Maintenance Chapter 6 4.5 Irrig
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BMP Maintenance Chapter 6 root syst
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BMP Maintenance Chapter 6 9.4 Mosqu
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BMP Maintenance Chapter 6 11.2 Debr
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BMP Maintenance Chapter 6 • Filte
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Construction BMP Fact Sheets Map Sy
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Chapter 7 Construction BMPs 1.0 Int
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Chapter 7 Construction BMPs 2.2 Sed
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Chapter 7 Construction BMPs Table 7
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Chapter 7 Construction BMPs o o The
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Chapter 7 Construction BMPs • Fin
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Chapter 7 Construction BMPs such as
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Chapter 7 Construction BMPs Pre-Con
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Chapter 7 Construction BMPs 4.1 Ero
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Construction BMPs Chapter 7 4.4 Mat
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Construction BMPs Chapter 7 • Slo
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Construction BMPs Chapter 7 • Pro
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Construction BMPs Chapter 7 constru
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Construction BMPs Chapter 7 Service
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Construction BMPs Chapter 7 When se
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Construction BMPs Chapter 7 • Tre
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Construction BMP Plan Symbols MS-2
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Construction BMP Plan Symbols MS-4
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Surface Roughening (SR) EC-1 Descri
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Surface Roughening (SR) EC-1 Novemb
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Temporary and Permanent Seeding (TS
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Soil Binders (SB) EC-3 Description
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Soil Binders (SB) EC-3 Factors to c
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Soil Binders (SB) EC-3 Installation
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Mulching (MU) EC-4 Description Mulc
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Compost Blanket and Filter Berm (CB
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Compost Blanket and Filter Berm (CB
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Rolled Erosion Control Products (RE
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EC-7 Temporary Slope Drains (TSD) M
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EC-7 Temporary Slope Drains (TSD) S
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EC-8 Temporary Outlet Protection (T
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Rough Cut Street Control (RCS) EC-9
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Rough Cut Street Control (RCS) EC-9
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EC-10 Earth Dikes and Drainage Swal
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EC-10 Earth Dikes and Drainage Swal
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Terracing (TER) EC-11 Description T
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Check Dams (CD) EC-12 Description C
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Check Dams (CD) EC-12 November 2010
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Check Dams (CD) EC-12 November 2010
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Streambank Stabilization (SS) EC-13
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Wind Erosion/Dust Control (DC) EC-1
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MM-1 Concrete Washout Area (CWA) se
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MM-1 Concrete Washout Area (CWA) CW
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MM-2 Stockpile Management (SM) When
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MM-2 Stockpile Management (SM) SP-4
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MM-2 Stockpile Management (SM) SP-6
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MM-3 Good Housekeeping Practices (G
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SC-1 Silt Fence (SF) Maintenance an
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SC-1 Silt Fence (SF) SF-4 Urban Dra
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SC-2 Sediment Control Log (SCL) Alt
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SC-2 Sediment Control Log (SCL) SCL
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Straw Bale Barrier (SBB) SC-3 Descr
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Straw Bale Barrier (SBB) SC-3 Novem
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SC-4 Brush Barrier (BB) Maintenance
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SC-5 Rock Sock (RS) RS-2 Urban Drai
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Inlet Protection (IP) SC-6 Descript
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Inlet Protection (IP) SC-6 • Remo
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Inlet Protection (IP) SC-6 August 2
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Inlet Protection (IP) SC-6 August 2
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Sediment Basin (SB) SC-7 Descriptio
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Sediment Basin (SB) SC-7 Illustrati
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Sediment Basin (SB) SC-7 August 201
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Sediment Basin (SB) SC-7 August 201
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SC-8 Sediment Trap (ST) ST-2 Urban
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Vegetated Buffers (VB) SC-9 Descrip
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SC-10 Chemical Treatment (CT) Maint
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SM-1 Construction Phasing/Sequencin
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SM-1 Construction Phasing/Sequencin
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SM-2 Protection of Existing Vegetat
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Construction Fence (CF) SM-3 Descri
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Construction Fence (CF) SM-3 Novemb
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SM-4 Vehicle Tracking Control (VTC)
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Stabilized Staging Area (SSA) SM-6
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Stabilized Staging Area (SSA) SM-6
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Street Sweeping and Vacuuming (SS)
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SM-8 Temporary Diversion Methods (T
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Dewatering Operations (DW) SM-9 Des
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Dewatering Operations (DW) SM-9 Nov
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Dewatering Operations (DW) SM-9 Nov
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SM-10 Temporary Stream Crossing (TS
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SM-11 Temporary Batch Plant (TBP) A
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Glossary 1 Note: This glossary is n
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Effluent Limitation Guidelines (ELG
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Low Impact Development (LID): LID i
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Revised Universal Soil Loss Equatio
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Bibliography Altitude Training Asso
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Bibliography U.S. Environmental Pro
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Bibliography Metcalf and Eddy, Inc.
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Bibliography Water Environment Fede
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