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Jennie Moonan mas 2017


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Presentation at Massachusetts Sustainable Communities and Campuses Conference on March 17, 2017

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Jennie Moonan mas 2017

  1. 1. Manchester-by-the-Sea Comprehensive Watershed Planning for Climate Change Sustainability by Land & Sea - 7th Massachusetts Sustainable Communities & Campuses Conference Endicott College March 17, 2017 Janet Moonan, P.E., Project Manager
  2. 2. The Community
  3. 3. Sawmill Brook Watershed Concerns
  4. 4. Sawmill Brook Watershed Concerns Inland Flooding • Poor Soils • Impervious Surface • Channelized Drainage Coastal Flooding • High Tide • Wave Action • Storm Surge Water Quality Issues • Bacteria • Low pH • Sedimentation
  5. 5. Flooding Impacts Community Assets People Built Environment Economy Natural Environment
  6. 6. Town Hall & Police WWTP Fire Station
  7. 7. Climate Change Adaptation- Opportunities for Wastewater Town Hall & Police WWTP Fire Station
  8. 8. Future Flooding from Coastal Influences
  9. 9. Big Picture View ... Strategic Thinking ■ Town Staff wanted to understand future impacts of climate change on the town, recognized comprehensive approach needed. ■ Funding strategy included applying for CZM Grants and FEMA Grants ■ Coordinated work between grants. ■ Included not only flood mitigation but habitat improvement and water quality improvements ■ To reduce risk and vulnerability of flooding on community assets, considered Green Stormwater Infrastructure
  10. 10. Green Stormwater Infrastructure… A lot of options to consider… Roof Drain Disconnects & Rain Harvesting Bioretention / Rain Gardens Infiltration Practices Constructed Wetlands Street Planters Porous Pavement Pretreatment & Filters Green Roofs Stream Bank Storage
  11. 11. An “Easy” Seven-Step Process to Assess Green Infrastructure 1. A desktop (GIS-based) screening and ranking; 2. Review of results and complete site visits; 3. Identify other site conditions that would impact implementation; 4. Conceptual sizing of GSI practices (volume treated, pollutant reduction, etc.); 5. A hydrologic and hydraulic model evaluation; 6. Calculation of pollutant load reduction; and 7. Development of costs … assess cost vs. benefit.
  12. 12. Desktop Assessment: Primary Screening
  13. 13. Desktop Assessment: Primary Screening
  14. 14. Desktop Assessment: Primary Screening
  15. 15. Desktop Assessment: Primary Screening
  16. 16. Desktop Assessment: Primary Screening
  17. 17. Desktop Assessment: Primary + Secondary Screening
  18. 18. Additional Considerations Permitting and Environment – Wetlands – Drinking water impacts – Habitat impacts – Historical area – Contamination – Sea Level Rise – Etc Qualitative Input – Community support – Cultivation of educational opportunities – Operation & Maintenance – Aesthetic and habitat improvement – Coordination with other town project – Etc
  19. 19. Field Work to Assess Green Infrastructure Assessment of: ■ Existing structures (23 culverts and tide gate) ■ Potential structural solutions (17 sites for Green Infrastructure/ Flood Mitigation)
  20. 20. What we found… Large parking areas at High School Parking at Elementary School Parking at Turf Field
  21. 21. What we found… Small flood storage areas Large flood storage areas
  22. 22. Defined extent of BMP corridors in Phase 2 Downtown Improvement areas What we found…
  23. 23. Let the modeling show… ■ Incorporated stormwater GSI into watershed-wide HEC-RAS model ■ Looked at current and future (2025, 2050, 2100) Scenarios ■ Even for larger projects (i.e. golf course flood storage, elementary school parking lot,) limited potential to reduce watershed-wide surface water elevations under all scenarios
  24. 24. Porous Asphalt Parking Area at Coach Field
  25. 25. Manchester is moving forward in these ways… ■ Updating Town Master Plan to identify climate change risks, vulnerability to community assets and mitigation solutions ■ Formalizing actions in an approved FEMA Hazard Mitigation Plan, including GSI in downtown and to address roadway flooding ■ Keeping the public informed and engaged through public workshops, web site update and news articles
  26. 26. Questions? Gabrielle Belfit, Senior Environmental Scientist, Project Manager – Phone: 508-564-7285 – Email: Janet Moonan, P.E., Project Engineer – Phone: 781-708-9826 – Email: Mary Reilly, Grants Administrator – Phone: 978-525-6427 – Email: Documents can be found the Manchester town website at: and