1. Theodore E. Scott, PE, CPESC, LEED AP Stormwater Maintenance, LLC Stormwater Consulting, Inc. 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 tes@MdSWM.com 410.785.0875 www.MdSWM.com www.SWMaintenance.com www.MdESD.com Home Builders Association of Maryland Stormwater Management Workshop June 14, 2011 Introduction to Environmental Site Design

3. 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

5. ESD Design & Review Process

6. Site and Resource Mapping

13. It all starts with Land Planning…

14. … which leads to Engineering.

15. Computations P E = Proposed Runoff less Woods Runoff Hydrologic Soil Group B %I RCN* PE=1'' 1.2'' 1.4'' 1.6'' 1.8'' 2.0'' 2.2'' 2.4'' 2.6'' 0% 61 HSG=B 5% 63 10% 65 15% 67 55 20% 68 60 55 55 25% 70 64 61 58 30% 72 65 62 59 55 35% 74 66 63 60 56 40% 75 66 63 60 56 45% 78 68 66 62 58 50% 80 70 67 64 60 55% 81 71 68 65 61 55 60% 83 73 70 67 63 58 65% 85 75 72 69 65 60 55 70% 87 77 74 71 67 62 57 75% 89 79 76 73 69 65 59 80% 91 81 78 75 71 66 61 85% 92 82 79 76 72 67 62 55 90% 94 84 81 78 74 70 65 59 55 95% 96 87 84 81 77 73 69 63 57 100% 98 89 86 83 80 76 72 66 59 55 Condition Land Use & Soils RCN Runoff Existing Woods, B 55 1000 cf Proposed 20% Impervious 70 4000 cf ESD Requirement (P E ) 3000 cf

17. Computational Resources www.MdESD.org

18. Computational Resources www.MdESD.org

19. Computational Resources Local Municipalities

20. ESD Practices

25. Group 1: Alternative Surfaces

41. Residential Design Example

42. Existing Conditions 1.75 acre lot B Soils

43. Proposed Conditions 3 Lots 25% Impervious Target P E = 1.6 inches

44. PERMEABLE PAVING Alternative Surfaces 8600 sf PERMEABLE PAVING Target P E = 1.6 inches Proposed P E = 0.17 inches

45. ESD Practices at or Near Sources DISCONNECTIONS SWALE Target P E = 1.6 inches Proposed P E = 0.30 inches RAIN BARRELS

46. Integrated Small-Scale Practices RAIN GARDENS

47. SWALE RAIN GARDENS DISCONNECTIONS PERMEABLE PAVING All Practices Target P E = 1.6 inches Proposed P E = 0.99 inches

48. TIME CHECK Theodore E. Scott, PE, CPESC, LEED AP Stormwater Maintenance, LLC Stormwater Consulting, Inc. 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 tes@MdSWM.com 410.785.0875 www.AppliedStormwater.com Environmental Site Design Maryland Stormwater Design Manual

49. Commercial Design Example

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

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

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

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

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

55. THANKS! Theodore E. Scott, PE, CPESC, LEED AP Stormwater Maintenance, LLC Stormwater Consulting, Inc. 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 tes@MdSWM.com 410.785.0875 www.AppliedStormwater.com Environmental Site Design Maryland Stormwater Design Manual