Theodore E. Scott, PE, CPESC, LEED AP Stormwater Maintenance, LLC Stormwater Consulting, Inc. 128 Cockeysville Road, Suite...
<ul><li>Environmental Site Design (ESD) </li></ul>Low Impact Development (LID) Better Site Design Green Infrastructure Sus...
ESD Philosophy Replicate Existing (Woods!) hydrology Small scale practices Non-structural techniques Site planning techniq...
Defining ESD to the MEP -  “THE RULES” <ul><li>Design process </li></ul><ul><li>Site and resource mapping </li></ul><ul><l...
ESD Design & Review Process
Site and Resource Mapping
Better Site Design <ul><li>CWP 1998 </li></ul><ul><li>Narrow streets & sidewalks  </li></ul><ul><li>Cul-de-sacs – smaller ...
Better Site Design <ul><li>Reduce impervious areas </li></ul><ul><li>Road widths, parking, etc.  </li></ul>
Better Site Design <ul><li>Open vegetated channels </li></ul>
Better Site Design <ul><li>Site fingerprinting </li></ul>
Better Site Design <ul><li>Clustering </li></ul>
Better Site Design <ul><li>Maintain Existing  Drainage  Patterns </li></ul><ul><li>Minimize storm drains </li></ul><ul><li...
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...
Computations  <ul><li>1” Storm Runoff – MANDITORY to treat with ESD Practices </li></ul><ul><li>1 Year Storm (2.6”+/-) tre...
Computational Resources www.MdESD.org
Computational Resources www.MdESD.org
Computational Resources Local Municipalities
ESD Practices
ESD  Design  Philosophy <ul><li>Site design priorities </li></ul><ul><li>Eliminate stormwater impacts with materials  sele...
ESD Practices  <ul><li>Group 1: </li></ul><ul><li>Alternative Surfaces </li></ul><ul><li>Group 2: </li></ul><ul><li>Nonstr...
Group 1: Alternative Surfaces <ul><li>A-1 Green Roofs </li></ul><ul><li>Thickness Options:  2 ”, 3”, 4”, 6”, 8” </li></ul>
Group 1: Alternative Surfaces <ul><ul><li>A-2 Permeable Pavements </li></ul></ul>
Group 1: Alternative Surfaces
Group 1: Alternative Surfaces <ul><li>A-3 Reinforced Turf </li></ul>
Group 2: Nonstructural Practices <ul><ul><li>N-1 Disconnection of rooftop runoff </li></ul></ul>
Group 2: Nonstructural Practices <ul><ul><li>N-2 Disconnection of non-rooftop runoff </li></ul></ul>
Group 2: Nonstructural Practices <ul><ul><li>N-3 Sheetflow to conservation area </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-1 Rainwater Harvesting </li></ul></ul><ul><ul><li>Rain barrel sizing for full...
Group 3: Micro-scale Practices <ul><ul><li>M-2 Submerged Gravel wetlands </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-3 Landscape Infiltration </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-4 Infiltration Berm </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-5 Dry wells </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-bioretention </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-Bioretention  Max DA = 20,000 sf </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-bioretention </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-7 Rain gardens  Max DA 2000sf/10000sf </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-8 Swales </li></ul></ul>
Group 3: Micro-scale Practices <ul><ul><li>M-9 Enhanced Filters  Provides recharge </li></ul></ul>
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 ...
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 Roa...
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2011 6 14 Home Builders of MD Environmental Site Design Introduction

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Introduction to ESD presented at the Home Builders of Maryland 2011 Stormwater Management Workshop 6/14/2011

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Transcript of "2011 6 14 Home Builders of MD Environmental Site Design Introduction"

  1. 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
  2. 2. <ul><li>Environmental Site Design (ESD) </li></ul>Low Impact Development (LID) Better Site Design Green Infrastructure Sustainable Site Design
  3. 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
  4. 4. Defining ESD to the MEP - “THE RULES” <ul><li>Design process </li></ul><ul><li>Site and resource mapping </li></ul><ul><li>Better Site Design techniques </li></ul><ul><li>Structural practices only when necessary </li></ul><ul><li>Review process </li></ul><ul><li>Integrate ES&C </li></ul><ul><li>The design process will require the developer to adhere to the following procedures to achieve ESD to the MEP: </li></ul><ul><ul><li>Following the Design Process for New Development as outlined in the step wise procedures in Figure 5.1 </li></ul></ul><ul><ul><li>Developing a map that identifies natural resource areas and drainage patterns and devising strategies for protection and enhancement. </li></ul></ul><ul><ul><li>Minimizing total site imperviousness by implementing clustered development and other better site design techniques. </li></ul></ul><ul><ul><li>Demonstrating that all reasonable opportunities for meeting stormwater requirements using ESD have been exhausted by using natural areas and landscape features to manage runoff from impervious surfaces and that structural BMFs have been used only where absolutely necessary. </li></ul></ul><ul><ul><li>Participate in the comprehensive review process for interim plans review and approval at the conceptual, site development, and final phases ofproject design. </li></ul></ul><ul><ul><li>Integrating strategies for erosion and sediment control and stormwater management into a comprehensive development plan. </li></ul></ul><ul><ul><li>Phased SWM design & review process </li></ul></ul><ul><ul><li>Implement ESD planning techniques </li></ul></ul><ul><ul><li>ESD to the Maximum Extent Practicable (MEP) </li></ul></ul><ul><ul><li>Structural practices as last priority </li></ul></ul>LOD 5000 sf
  5. 5. ESD Design & Review Process
  6. 6. Site and Resource Mapping
  7. 7. Better Site Design <ul><li>CWP 1998 </li></ul><ul><li>Narrow streets & sidewalks </li></ul><ul><li>Cul-de-sacs – smaller radii </li></ul><ul><li>Open vegetated channels </li></ul><ul><li>Parking – hold at max / structured </li></ul><ul><li>Parking lot runoff – landscaped / bioretention </li></ul><ul><li>Open space – Cluster options </li></ul><ul><li>Setbacks – Reduce fronts and widths </li></ul><ul><li>Shared driveways, alternative surfaces </li></ul><ul><li>Rooftop runoff to pervious </li></ul><ul><li>Buffers with protection </li></ul><ul><li>Limit clearing and grading </li></ul><ul><li>Conservation of contiguous forest </li></ul><ul><li>Conservation incentives – density, flexibility </li></ul>
  8. 8. Better Site Design <ul><li>Reduce impervious areas </li></ul><ul><li>Road widths, parking, etc. </li></ul>
  9. 9. Better Site Design <ul><li>Open vegetated channels </li></ul>
  10. 10. Better Site Design <ul><li>Site fingerprinting </li></ul>
  11. 11. Better Site Design <ul><li>Clustering </li></ul>
  12. 12. Better Site Design <ul><li>Maintain Existing Drainage Patterns </li></ul><ul><li>Minimize storm drains </li></ul><ul><li>Avoid large facilities </li></ul><ul><li>Grading techniques </li></ul>
  13. 13. It all starts with Land Planning…
  14. 14. … which leads to Engineering.
  15. 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
  16. 16. Computations <ul><li>1” Storm Runoff – MANDITORY to treat with ESD Practices </li></ul><ul><li>1 Year Storm (2.6”+/-) treat P E to the MEP with ESD Practices </li></ul><ul><li>If P E not met and MEP proven – design structural practice from Chapter 3 </li></ul>
  17. 17. Computational Resources www.MdESD.org
  18. 18. Computational Resources www.MdESD.org
  19. 19. Computational Resources Local Municipalities
  20. 20. ESD Practices
  21. 21. ESD Design Philosophy <ul><li>Site design priorities </li></ul><ul><li>Eliminate stormwater impacts with materials selection </li></ul><ul><li>Treat stormwater as close to the source as possible – convey AFTER treatment </li></ul><ul><li>Use small-scale vegetated practices integrated throughout the site </li></ul><ul><li>Site design guidelines </li></ul><ul><li>Locate green spaces down-slope of impervious for treatment </li></ul><ul><li>Grade site to maintain sheet flow </li></ul><ul><li>Avoid concentrated flows </li></ul>
  22. 22. ESD Practices <ul><li>Group 1: </li></ul><ul><li>Alternative Surfaces </li></ul><ul><li>Group 2: </li></ul><ul><li>Nonstructural Practices </li></ul><ul><li>Group 3: </li></ul><ul><li>Microscale Practices </li></ul>
  23. 23. Group 1: Alternative Surfaces <ul><li>A-1 Green Roofs </li></ul><ul><li>Thickness Options: 2 ”, 3”, 4”, 6”, 8” </li></ul>
  24. 24. Group 1: Alternative Surfaces <ul><ul><li>A-2 Permeable Pavements </li></ul></ul>
  25. 25. Group 1: Alternative Surfaces
  26. 26. Group 1: Alternative Surfaces <ul><li>A-3 Reinforced Turf </li></ul>
  27. 27. Group 2: Nonstructural Practices <ul><ul><li>N-1 Disconnection of rooftop runoff </li></ul></ul>
  28. 28. Group 2: Nonstructural Practices <ul><ul><li>N-2 Disconnection of non-rooftop runoff </li></ul></ul>
  29. 29. Group 2: Nonstructural Practices <ul><ul><li>N-3 Sheetflow to conservation area </li></ul></ul>
  30. 30. Group 3: Micro-scale Practices <ul><ul><li>M-1 Rainwater Harvesting </li></ul></ul><ul><ul><li>Rain barrel sizing for full credit </li></ul></ul><ul><ul><li>311.69 gallons / 500 sf roof </li></ul></ul><ul><ul><li>5.67 - 55 gallon drums </li></ul></ul>
  31. 31. Group 3: Micro-scale Practices <ul><ul><li>M-2 Submerged Gravel wetlands </li></ul></ul>
  32. 32. Group 3: Micro-scale Practices <ul><ul><li>M-3 Landscape Infiltration </li></ul></ul>
  33. 33. Group 3: Micro-scale Practices <ul><ul><li>M-4 Infiltration Berm </li></ul></ul>
  34. 34. Group 3: Micro-scale Practices <ul><ul><li>M-5 Dry wells </li></ul></ul>
  35. 35. Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-bioretention </li></ul></ul>
  36. 36. Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-Bioretention Max DA = 20,000 sf </li></ul></ul>
  37. 37. Group 3: Micro-scale Practices <ul><ul><li>M-6 Micro-bioretention </li></ul></ul>
  38. 38. Group 3: Micro-scale Practices <ul><ul><li>M-7 Rain gardens Max DA 2000sf/10000sf </li></ul></ul>
  39. 39. Group 3: Micro-scale Practices <ul><ul><li>M-8 Swales </li></ul></ul>
  40. 40. Group 3: Micro-scale Practices <ul><ul><li>M-9 Enhanced Filters Provides recharge </li></ul></ul>
  41. 41. Residential Design Example
  42. 42. Existing Conditions 1.75 acre lot B Soils
  43. 43. Proposed Conditions 3 Lots 25% Impervious Target P E = 1.6 inches
  44. 44. PERMEABLE PAVING Alternative Surfaces 8600 sf PERMEABLE PAVING Target P E = 1.6 inches Proposed P E = 0.17 inches
  45. 45. ESD Practices at or Near Sources DISCONNECTIONS SWALE Target P E = 1.6 inches Proposed P E = 0.30 inches RAIN BARRELS
  46. 46. Integrated Small-Scale Practices RAIN GARDENS
  47. 47. SWALE RAIN GARDENS DISCONNECTIONS PERMEABLE PAVING All Practices Target P E = 1.6 inches Proposed P E = 0.99 inches
  48. 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. 49. Commercial Design Example
  50. 50. Example Project Traditional 2000 Design Approach SAND FILTER U/G CMP Cpv
  51. 51. Example Project Design Approach #1 MICRO-BIORETENTION REVERSED GRADES
  52. 52. Example Project Design Approach #2 CISTERN PERMABLE PAVING SWALE GREENROOF
  53. 53. Example Project Design Approach #3 MICRO-BIORETENTION PERMABLE PAVING SWALE
  54. 54. Example Project Design Approach #4 SUBMERGED WETLANDS RAIN GARDEN PLANTER BOXES MICRO-BIORETENTION
  55. 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

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