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T-11 Underground BMPs • Traffic Loading: Due to space constraints, in some situations, underground BMPs may be located in a right-of-way or other location where there may be traffic loadings. Many underground BMPs are or can be constructed for HS-20 traffic loading. Take additional measures when necessary to ensure that the BMP is designed for the anticipated loading. • Potential for Flooding of Adjacent Structures or Property: For underground BMPs, it is important that the hydraulic grade line be analyzed to evaluate the potential for backwater in the storm sewer system. In addition, some types of underground BMPs, such as catch basin inserts, have the potential to clog and cause flooding if not frequently maintained. Designing for Maintenance All underground BMPs must be sized so that routine maintenance is not required more than once per year. The only exception to this is inlet inserts which may need to be cleaned as frequently as following each runoff producing event. Because underground BMPs are generally less visible and more difficult to access than surface-based BMPs, regular maintenance and early detection of performance issues can be a challenge. When developing a design for an underground BMP, the engineer should ensure that all portions of the underground facility can be accessed with maintenance equipment. For multi-chambered systems, access should be provided to each chamber, and openings should be of sufficient size to accommodate the equipment recommended by the manufacturer or designer for maintenance. Photograph UG-2. Maintenance access to all chambers of an underground BMP is an important design consideration. Photo courtesy of Robert Pitt. Underground BMPs are generally considered confined spaces and OSHA confined space training typically will be required if a person must enter the underground BMP to perform maintenance. In all cases, a maintenance plan should be developed at the time that the underground BMP is designed. The maintenance plan should specify, at a minimum, quarterly inspections with maintenance performed as needed based on inspections. The required inspection frequency may be reduced to biannually if, after two or more years, the quarterly regimen demonstrates that this will provide adequate maintenance. Local governments may consider requiring owners of underground BMPs to provide written inspection and maintenance documentation to better assure that required inspection and maintenance activities are taking place. When the BMP includes a pump system, pump inspection and maintenance records should also be included. UG-4 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3
Underground BMPs T-11 Questions to Ask When Considering an Underground BMP Feasibility • Are surface-based BMPs truly infeasible? • Does the device help mitigate the adverse hydrologic impact of development? • What are the pollutants of interest and are the treatment processes associated with the BMP expected to be effective for these pollutants? • What is the whole life cycle cost of the BMP? Location • If applicable, is the device equipped for HS-20 traffic loading? • Will the device be placed so that parked vehicles have potential to block access? Performance • Is stormwater monitoring required to demonstrate effectiveness of the BMP? • Where else has a similar BMP been applied in the region? How effective was the application? • Have independent, third-party data been collected to support performance claims? Design • Is pretreatment required? • Should the device serve as a step in a treatment train instead of a standalone BMP? • Are there mechanisms to minimize mobilization of accumulated pollutants? • Is there a maximum drainage area recommended for the device? • Is the device sized properly for the contributing drainage area and imperviousness? • What is the head loss through the device for the full range of flow conditions? • What are design water quality flow rates? • How does the bypass operate when flow rates are greater than those for the water quality event? • Have hydraulic grade lines been prepared for the device to evaluate potential surcharging and flooding? Installation and Maintenance • What support does the manufacturer provide for design, installation and/or maintenance? • Who will be on-site during and after construction to ensure that the BMP has been installed correctly? • What are the maintenance requirements, including access? Is the overall site plan compatible with assured long-term maintenance? Will the underground BMP be located in an easement to assure long-term access? • What is the recommended maintenance frequency, and what is the cost and method of disposal for removed material? • What parts of the BMP will need to be maintained and/or replaced (filter media, absorbent pillows, etc.) and what are the associated costs? • What monitoring will occur? • Are access openings large enough to accommodate the equipment that will be used to maintain the BMP? • Who is responsible for inspection and maintenance? • What proof of maintenance will be required of the owner to show that inspections and routine maintenance is performed? • What level of effort is required to determine if the BMP is being maintained? Can this be done visually? • Is there a contingency plan for failure of essential components (pumps, screens, obstructions in flow paths, etc.)? June 2012 Urban Drainage and Flood Control District UG-5 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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Page 258 and 259: T-11 Underground BMPs Underground B
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Page 264 and 265: T-11 Underground BMPs • Wisconsin
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Page 268 and 269: T-12 Outlet Structures Orifice Plat
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Page 272 and 273: T-12 Outlet Structures Table OS-3a.
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Page 304 and 305: S-4 Illicit Discharge Controls •
Page 307 and 308: Good Housekeeping S-5 Description G
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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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