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T-11 Underground BMPs For these reasons, it is important to discuss the installation of the underground BMP with the manufacturer prior to selecting a contractor so that the installation requirements are clearly understood. Construction observation by the design engineer, and, if possible, a manufacturer's representative is essential for proper installation. At a minimum, the installation should be inspected by the manufacturer's representative once completed. Any deficiencies of the installation identified by the manufacturer's inspection should be corrected immediately. UG-10 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3
Outlet Structures T-12 Description This section provides guidance and details for outlet structures for use primarily with BMPs utilizing sedimentation, (i.e., extended detention basins (EDBs), retention ponds, and constructed wetland ponds). The information provided in this section includes guidance for different size watersheds as well as for incorporating Full Spectrum Detention as described in the Storage chapter of Volume 2. The details contained in this Fact Sheet are intended to provide a starting point for design. UDFCD recommends that design details for outlet structures be specific for each site with structural details drawn to scale. The details provided in this Fact Sheet are not intended to be used without modification or additional detail. Outlet Design Photograph OS-1. Although each site is different, most sedimentation BMPs have similar outlet structures. Each structure should include a partially submerged orifice plate with a screen (or grate) protecting the orifice plate from clogging, and an overflow weir for flows exceeding the WQCV or excess urban runoff volume (EURV), when full spectrum detention is used. Large Watershed Considerations UDFCD recommends that water quality treatment be provided close to the pollutant source. This is a fundamental concept of Low Impact Development (LID). Although flood control facilities, including Full Spectrum Detention facilities, have been shown to be very effective for watersheds exceeding one square mile, this is not the case for water quality facilities. One reason for this is that the baseflow associated with a larger watershed will vary and can be difficult to estimate. The orifice plate should be designed to pass the baseflow while detaining the water quality capture volume (WQCV) for approximately 40 hours. When the baseflow is overestimated, the WQCV is not detained for the recommended time, passing through without treatment. When the baseflow is underestimated, the elevation of the permanent pool will be higher than designed, causing maintenance issues as well as reducing the volume available for detention of the WQCV, which also allows for a portion of this volume to pass through without treatment. For this reason, UDFCD recommends that facilities designed for both water quality and flood control be limited, where possible, to watersheds without a baseflow. The maximum recommended watershed for combined facilities is one square mile. Additional discussion on designing for baseflows is provided in the EDB BMP Fact Sheet (T-5). Designing for Maintenance Rather than using the minimum criteria, consider maximizing the width of the trash rack to the geometry of the outlet. This will reduce clogging and frequency of maintenance. Reduced clogging in EDB outlet structures will preserve the initial surcharge volume thus reducing frequency of inundation in the bottom of the basin. This will benefit the grasses and reduce longterm EDB maintenance requirements (including sediment removal in the grassed area) and may reduce the life-cycle cost of the BMP. August 2013 Urban Drainage and Flood Control District OS-1 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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Chapter 2 BMP Selection Contents 1.
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BMP Selection Chapter 2 area is too
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BMP Selection Chapter 2 provided by
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BMP Selection Chapter 2 Table 2-2.
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BMP Selection Chapter 2 1.4 Storage
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BMP Selection Chapter 2 1.8 Online
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BMP Selection Chapter 2 reflect the
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BMP Selection Chapter 2 Figure 2-2.
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BMP Selection Chapter 2 3.0 Life Cy
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BMP Selection Chapter 2 5.0 Referen
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Figure 3-15. Colorado Green Impervi
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Calculating the WQCV and Volume Red
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Chapter 4 Treatment BMPs Contents 1
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Treatment BMPs Chapter 4 2.0 Treatm
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Treatment BMPs Chapter 4 3.0 Refere
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Grass Buffer T-1 4. Buffer Slope: T
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Grass Buffer T-1 Turf grasses such
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Grass Buffer T-1 Figure GB-2. Typic
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Grass Buffer T-1 References Barrett
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T-2 Grass Swale • Provide access
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T-2 Grass Swale 8. Underdrain: An u
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T-2 Grass Swale Figure GS-1. Grass
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T-2 Grass Swale References Chow, Ve
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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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Page 221 and 222: Permeable Pavement Systems T-10 Des
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Page 225 and 226: Permeable Pavement Systems T-10 inf
Page 227 and 228: Permeable Pavement Systems T-10 3.
Page 229 and 230: Permeable Pavement Systems T-10 Fig
Page 231 and 232: Permeable Pavement Systems T-10 Tab
Page 233 and 234: Permeable Pavement Systems T-10 con
Page 235 and 236: Permeable Pavement Systems T-10 No-
Page 241 and 242: Permeable Pavement Systems T-10 Des
Page 243 and 244: Permeable Interlocking Concrete Pav
Page 249 and 250: Concrete Grid Pavement T-10.2 Note:
Page 251: Pervious Concrete T-10.3 This BMP F
Page 254 and 255: T-10.4 Porous Gravel Designing for
Page 256 and 257: T-10.5 Reinforced Grass Designing f
Page 258 and 259: T-11 Underground BMPs Underground B
Page 260 and 261: T-11 Underground BMPs • Traffic L
Page 262 and 263: T-11 Underground BMPs Design Proced
Page 264 and 265: T-11 Underground BMPs • Wisconsin
Page 268 and 269: T-12 Outlet Structures Orifice Plat
Page 270 and 271: T-12 Outlet Structures 100 A t / A
Page 272 and 273: T-12 Outlet Structures Table OS-3a.
Page 274 and 275: T-12 Outlet Structures Outlet Geome
Page 276 and 277: T-12 Outlet Structures Figure OS-2.
Page 283: Chapter 5 Source Control BMPs Conte
Page 286 and 287: Source Control BMPs Chapter 5 Table
Page 288 and 289: Source Control BMPs Chapter 5 • P
Page 290 and 291: Source Control BMPs Chapter 5 • S
Page 292 and 293: Source Control BMPs Chapter 5 5.0 R
Page 294 and 295: S-1 Covering Outdoor Storage and Ha
Page 296 and 297: S-2 Spill Prevention, Containment a
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Page 300 and 301: S-3 Disposal of Household Waste •
Page 302 and 303: S-3 Disposal of Household Waste •
Page 304 and 305: S-4 Illicit Discharge Controls •
Page 307 and 308: Good Housekeeping S-5 Description G
Page 309: Good Housekeeping S-5 purchase orde
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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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