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).

4. ESD Philosophy Replicate Existing (Woods!) hydrology Small scale practices Non-structural techniques Site planning techniques Conservation of natural features Drainage patterns Soils Vegetation Minimize impervious surfaces Slow down runoff Timing Infiltration Evapotranspiration 1-Year Design Storm

5. ESD Background

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

12. ESD Background 2000 to Present - 2000 Maryland Design Manual infiltration basin infiltration trench pocket wetland pond/wetland system ED shallow wetland shallow wetland wet extended detention multiple pond system wet pond dry swale bio-retention pocket sand filter organic filter perimeter sand filter underground sand filter surface sand filter wet swale STRUCTURAL PRACTICES

14. ESD Background 2000 to Present - 2000 Maryland Design Manual OPTIONAL

15. ESD Background 2000 to Present - 2000 Maryland Design Manual

17. ESD Background 2000 to Present - 2000 Maryland Design Manual NON-STRUCTURAL PRACTICES NOT IMPLEMENTED!

18. ESD Background 2000 to Present - 2000 Maryland Design Manual INTEGRATED SMALL-SCALE PRACTICES NOT IMPLEMENTED!

19. ESD Background 2000 to Present - 2000 Maryland Design Manual

20. Enter… Environmental Site Design Replicate Existing Hydrology Small scale practices Non-structural techniques Site planning techniques Resource constraints

22. ESD Design & Review Process

23. Site and Resource Mapping

30. ESD Practices

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

34. Group 1: Alternative Surfaces

36. Group 1: Alternative Surfaces

52. Design Examples

53. Example Project Traditional 2000 Design Approach SAND FILTER U/G CMP Cpv

54. Example Project Design Approach #1 MICRO-BIORETENTION REVERSED GRADES

55. Example Project Design Approach #2 CISTERN PERMABLE PAVING SWALE GREENROOF

56. Example Project Design Approach #3 MICRO-BIORETENTION PERMABLE PAVING SWALE

57. Example Project Design Approach #4 SUBMERGED WETLANDS RAIN GARDEN PLANTER BOXES MICRO-BIORETENTION

58. LEED CREDITS

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

63. Redevelopment

65. Local Jurisdiction Update

68. THANKS! Theodore E. Scott, PE, CPESC, LEED AP Stormwater Maintenance, LLC T.E. Scott & Associates, Inc. 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 tes@MdSWM.com 410.785.0875 www.AppliedStormwater.com Environmental Site Design Maryland’s Stormwater Design Manual