Overview presentation by Theodore E. Scott, PE, CPESC, LEED AP on recent changes to the Maryland Stormwater Management Design Manual that requires the use of Environmental Site Design (ESD).
7. ESD Background Stormwater Management Act of 2007 October 1, 2007 Act Effective May 5, 2009 COMAR revisions effective April 15, 2009 Design Manual Chapter 5 Revised November 11, 2009 Local ordinances due to MDE May 4, 2010 Local ordinances must be adopted
31. ESD Design Philosophy Treatment Priorities Eliminate stormwater impacts with materials selection Treat stormwater as close to the source as possible – convey AFTER treatment Use small-scale vegetated practices integrated throughout the site Site layout guidelines Locate green spaces down-slope of impervious for treatment Grade site to maintain sheet flow Avoid concentrated flows
60. LEED Sustainable sites 6.1 Quantity Control * Af=13% for 100% Impervious ESD PRACTICE PEAK VOLUME A-1 Green Roofs Partial N A-2 Permeable Pavements Yes – 12” Base Maybe/Enhanced A-3 Reinforced Turf Partial Maybe N-1 Disconnection of Rooftop Runoff N N N-2 Disconnection of Non-Rooftop Runoff N N N-3 Sheetflow to Conservation Areas N N M-1 Rainwater Harvesting Partial Partial M-2 Submerged Gravel Wetland N N M-3 Landscape Infiltration Yes if Enhanced* Partial M-4 Infiltration Berms N N M-5 Dry Wells Partial Yes if Enhanced M-6 Micro-Bioretention Yes if Enhanced* Yes if Enhanced M-7 Rain Gardens Yes if Enhanced* Yes if Enhanced M-8 Swales N N M-9 Enhanced Filters Yes if Enhanced Yes if Enhanced