Little Crum Creek BMP Sites - Preliminary Recommendations

1. Site: Ridley Shopping Center (Home Depot, Acme, Staples, Pathmark, etc.)
   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_53m_11.5s NORTH, Longitude: 75d_19m_38.4s WEST
   Elevation: 78 ft
   Hydrologic Zone: lowlands
   Riparian? : yes
   
   • BMP: Green Roofs on flat roofs of commercial buildings
     Infiltration? : no
     Contributing Area: 6.6 (acre)
     Benefits:
     • Volume Reduction
     • Energy Savings
     • Heat Island Reduction
   Comment: Green roof is ideally suited for large flat roofs.
   • BMP: Bioretention
     Infiltration? : no
     Contributing Area: 14.7 (acre)
     Benefits:
     • Volume Reduction
     • Groundwater Recharge
     • Pollutant Washoff Reduction
   Comment: Parking lot well suited for bioretention islands with evapotranspiration.
2. Site: Harper Realty Planned Super Wawa Site
   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_53m_1.5s NORTH, Longitude: 75d_19m_48.5s WEST
   Elevation: 54 ft
   Hydrologic Zone: lowlands
   Riparian? : yes
   
   • BMP: Detention Basin with Sediment Traps
     Infiltration? : no
     Contributing Area: 33 (acre)
     Benefits:
     • Peak Flow Reduction
     • Stream Channel Erosion Reduction
     • Pollutant Washoff Reduction
   Comment: The size of the proposed stormwater retention facilities could be increased beyond that required by the municipal ordinances to also capture excess upstream runoff generated by Ridley Shopping Center to protect the stream from excessive bank erosion.
   • 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: New commercial property will cover the channel of a major tributary to Little Crum Creek. But significant stream length downstream of the site exists on property owned by the developer. In this area, the stream banks can be restored to their natural state. Also a riparian wetland should be restored at the confluence of this tributary with the main branch of the creek. These projects can help to compensate for covering the stream channel.
3. 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_53m_32s NORTH, Longitude: 75d_19m_45s WEST
   Elevation: 110 ft
   Hydrologic Zone: headwaters and lowlands
   Riparian? : partially
   
   • BMP: Disconnect Downspouts from Storm Sewer
     Infiltration? : yes, in headwaters sections
     Contributing Area: 524 (Acres)
     Benefits:
     • Runoff Volume Reduction
     • Water Quality
     • Pollutant Washoff Reduction
     • Enhanced Evapotranspiration
   Comment: Develop a program in the Township 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.