Little Crum Creek BMP Sites - Preliminary Recommendations

1. Site: Swarthmore Swim CLub
   Map of Location in Watershed (click to view - site outlined in red)
   Aerial Image of Site (click to view - site outlined in red)
   Coordinates - Latitude: 39d_54m_23.10s NORTH, Longitude: 75d_20m_18.63s WEST
   Elevation: 134 ft
   Hydrologic Zone: headwaters
   Riparian? : yes
   
   • BMP: Restoration of Wetland and Stream Bank
     Infiltration? : no
     Contributing Area: 0.5 (acre)
     Benefits:
     • Riparian Habitat Restoration and Preservation
     • Water Quality
     • Enhanced Evapotranspiration
   Comment: Removal of damaged concrete channel replaced with restored natural streambank. Restore natural flow through existing riparian wetland and enhance with native wetland plantings.
   • BMP: Constructed Wetland
     Infiltration? : yes
     Contributing Area: 4 (acre)
     Benefits:
     • Volume Reduction
     • Groundwater Recharge
     • Pollutant Washoff Reduction
     • Bank Erosion Reduction
   Comment: Divert a portion of stormwater flow presently carried in culverts into constructed wetlands proposed to be build adjacent to natural riparian wetlands to handle runoff from parking lot, service road, rooftop, pool deck, and an existing diversion from adjacent wooded PECO property in Springfield.
2. Site: Swarthmore Business District
   Map of Location in Watershed (click to view - site outlined in red)
   Aerial Image of Site (click to view - site outlined in red)
   Coordinates - Latitude: 39d_54m_6.7s NORTH, Longitude: 75d_20m_58.6s WEST
   Elevation: 129 ft
   Hydrologic Zone: headwaters
   Riparian? : no
   
   • BMP: Green Roofs
     Infiltration? : no
     Contributing Area: 2.8 (acre)
     Benefits:
     • Runoff Volume Reduction
     • Peak Flow Reduction
     • Enhanced Evapotranspiration
     • Pollutant Washoff Reduction
   Comment: Installation of green roofs on buildings with flat roofs in commercial district and nearby high density residential buildings.
   • BMP: Permeable Pavement
     Infiltration? : yes
     Contributing Area: 4.1 (acre)
     Benefits:
     • Runoff Volume Reduction
     • Peak Flow Reduction
     • Pollutant Washoff Reduction
   Comment: Includes parking lots serving businesses and apartment buildings including street parking. Green roofs and permeable pavement projects will involve transferring Swarthmore College's recent experience with cost and performance of both of these technologies.
3. Site: Riparian Zone in Swarthmore Borough including the unbuilt Harvard Avenue Right of Way
   Map of Location in Watershed (click to view - site outlined in red)
   Zoom to Harvard Avenue Right of Way (click to view - site outlined in red)
   Coordinates - Latitude: 39d_53m_52.9s NORTH, Longitude: 75d_20m_19.3s WEST
   Elevation: 85 ft
   Hydrologic Zone: headwaters and lowlands
   Riparian? : yes
   
   • BMP: Riparian Zone Restoration
     Infiltration? : no
     Contributing Area: 4.1 (stream length) (miles)
     Benefits:
     • Riparian Habitat Restoration and Preservation
     • Water Quality
     • Pollutant Washoff Reduction
   Comment: Develop a program in the Borough to encourage and support private residential land owners in the riparian zone to develop buffer strips with shrubs, trees, and runoff filtering grasses with limited mowed areas.
   • BMP: Riparian Conservation Easements
     Infiltration? : no
     Contributing Area: 15 (acre)
     Benefits:
     • Riparian Habitat Restoration and Preservation
     • Water Quality
     • Pollutant Washoff Reduction
   Comment: Develop a program in the Borough to promote conservation easements to preserve the riparian zones having high priority as identified in Phase 1 of the Little Crum Creek Action Plan report. RUTGERS AVE. SCHOOL WOODS: This undeveloped, wooded riparian area behind the Rutgers Ave. School is owned by the Wallingford-Swarthmore School District. HARVARD AVE RIGHT OF WAY: This strip of heavily wooded green space is on several parcels of private property along a historic transportation right of way which at one time was to have been an extension of Harvard Avenue. The right of way extends into the upper part of Ridley Township.
4. Site: Low Intensity Residential Neighborhoods
   Map of Location in Watershed (click to view - site outlined in red)
   Aerial Image of Site (click to view - site outlined in red)
   Coordinates - Latitude: 39d_54m NORTH, Longitude: 75d_21m WEST
   Elevation: 132 ft
   Hydrologic Zone: headwaters and lowlands
   Riparian? : partially
   
   • BMP: Disconnect Downspouts from Storm Sewer
     Infiltration? : yes
     Contributing Area: 467 (Acres)
     Benefits:
     • Runoff Volume Reduction
     • Water Quality
     • Pollutant Washoff Reduction
     • Enhanced Evapotranspiration
   Comment: Develop a program in the Borough to encourage and subsidize private residential land owners to install rain barrels and rain gardens and to connect roof gutters and other drains to them while disconnecting them from the storm sewer system.