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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
[object Object],Low Impact Development (LID) Better Site Design Green Infrastructure Sustainable Site Design
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
Defining ESD to the MEP -  “THE RULES” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],LOD 5000 sf
ESD Design & Review Process
Site and Resource Mapping
Better Site Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Better Site Design ,[object Object],[object Object]
Better Site Design ,[object Object]
Better Site Design ,[object Object]
Better Site Design ,[object Object]
Better Site Design ,[object Object],[object Object],[object Object],[object Object]
It all starts with Land Planning…
… which leads to Engineering.
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
Computations  ,[object Object],[object Object],[object Object]
Computational Resources www.MdESD.org
Computational Resources www.MdESD.org
Computational Resources Local Municipalities
ESD Practices
ESD  Design  Philosophy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ESD Practices  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Group 1: Alternative Surfaces ,[object Object],[object Object]
Group 1: Alternative Surfaces ,[object Object]
Group 1: Alternative Surfaces
Group 1: Alternative Surfaces ,[object Object]
Group 2: Nonstructural Practices ,[object Object]
Group 2: Nonstructural Practices ,[object Object]
Group 2: Nonstructural Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object],[object Object],[object Object],[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Group 3: Micro-scale Practices ,[object Object]
Residential  Design Example
Existing Conditions 1.75 acre lot B Soils
Proposed Conditions 3 Lots 25% Impervious Target P E  = 1.6 inches
PERMEABLE PAVING Alternative Surfaces 8600 sf PERMEABLE PAVING Target P E  = 1.6 inches Proposed P E  = 0.17 inches
ESD Practices at or Near Sources DISCONNECTIONS SWALE Target P E  = 1.6 inches Proposed P E  = 0.30 inches RAIN BARRELS
Integrated Small-Scale Practices RAIN GARDENS
SWALE RAIN GARDENS DISCONNECTIONS PERMEABLE PAVING All Practices Target P E  = 1.6 inches Proposed P E  = 0.99 inches
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
Commercial Design Example
Example Project  Traditional 2000 Design Approach SAND FILTER U/G CMP Cpv
Example Project  Design Approach #1 MICRO-BIORETENTION REVERSED GRADES
Example Project  Design Approach #2 CISTERN PERMABLE PAVING SWALE GREENROOF
Example Project  Design Approach #3 MICRO-BIORETENTION PERMABLE PAVING SWALE
Example Project  Design Approach #4 SUBMERGED WETLANDS RAIN GARDEN PLANTER BOXES MICRO-BIORETENTION
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

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2011 6 14 Home Builders of MD Environmental Site Design Introduction

  • 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
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  • 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
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  • 5. ESD Design & Review Process
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  • 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
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  • 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
  • 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
  • 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