Little Crum Creek BMP Sites - Preliminary Recommendations

1. Site: Ridley Middle and Elementary Schools
   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_52m_42s NORTH, Longitude: 75d_19m_45s WEST
   Elevation: 70 ft
   Hydrologic Zone: lowlands
   Riparian? : yes
   
   • BMP: Green Roofs on flat roofs of school buildings
     Infiltration? : no
     Contributing Area: 3.0 (acre)
     Benefits:
     • Volume Reduction
     • Energy Savings
     • Heat Island Reduction
   Comment: Green roof is ideally suited for large flat roofs. Roof lifetime is extended significantly which reduces future maintenance expenses.
   • BMP: Bioretention
     Infiltration? : possible depending on site tests
     Contributing Area: 3.3 (acre)
     Benefits:
     • Volume Reduction
     • Groundwater Recharge
     • Pollutant Washoff Reduction
     • Enhanced Evapotranspiration
   Comment: Parking lots well suited for bioretention islands with evapotranspiration.
2. 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_52m_50s NORTH, Longitude: 75d_19m_41s WEST
   Elevation: 85 ft
   Hydrologic Zone: headwaters and lowlands
   Riparian? : partially
   
   • BMP: Disconnect Downspouts from Storm Sewer
     Infiltration? : yes, in headwaters sections
     Contributing Area: 228 (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.