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Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
Low Impact Development: Jackson Square Case Study
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Low Impact Development: Jackson Square Case Study

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  • 1. Low Impact Development: Jackson Square Case Study Presented by John M. Schmid, P.E., Senior Project Manager © 2007 Nitsch Engineering Building better communities with you
  • 2. Stormwater Management Design Criteria Mitigate the peak rate of stormwater runoff to pre-existing levels (Boston Water and Sewer Commission requirement) • 2- and 10-year storm events Encourage groundwater recharge (City of Boston requirement) • Swales, Pervious Pavement, Perforated Pipes Mitigate the project’s infrastructure costs (Owner’s requirement) • Strive for non-redundant systems – i.e.: green roof versus below grade perforated pipe detention system
  • 3. Low Impact Development (LID) Initiatives Jackson Square intends to utilize: Green Roof Systems Rain Gardens Vegetated Swales Pervious Pavements
  • 4. Jackson Square – Existing Conditions Columbus Avenue at Centre Street, Boston, MA Site I: 60,287 sf CN=86 Site II: 216,929 sf CN=94 Site III: 212,187 sf CN=90 * Urban Fill – “D” Soils
  • 5. Jackson Square – Conventional Utility Plan Site I: 60,287 sf CN=94 Site II: 216,929 sf CN=95 Site III: 212,187 sf CN=91 1. Underground detention systems 2. Conventional catch basin & pipe systems 3. Conventional Roofs
  • 6. Jackson Square – Proposed Green Improvements Site I: 60,287 sf CN=88 Site II: 216,929 sf CN=89 Site III: 212,187 sf CN=87 1. 50%-75% Green roofs 2. Rain Gardens 3. Vegetated Swales
  • 7. Comparing Design Alternatives Curve Number (CN) Value Comparison: Existing Conventional Green Roof CN Value CN Value CN Value Site I 86 94 88 Site II 94 95 89 Site III 90 91 87
  • 8. Jackson Square LID Initiatives Green Roof Systems Components of Green Roofs Essential Waterproofing Membrane Root barrier Drainage Layer Filter Fabric Growing Medium (Substrate) Vegetation Optional Membrane Protection layer Insulation Water Retention Layer Erosion Protection Layer Irrigation System Water Features, Walkways, Curbs, Railings, Lighting
  • 9. Jackson Square LID Initiatives Rain Gardens
  • 10. Jackson Square LID Initiatives Vegetated Swales
  • 11. Jackson Square LID Initiatives Pervious Pavement
  • 12. Any Questions? THANK YOU! Contact Information John M. Schmid, P.E., Senior Project Manager Nitsch Engineering 186 Lincoln Street, Suite 200 Boston, MA 02111 (617) 338-0063 jschmid@nitscheng.com

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