Town Center Subbasin Study Report - Bellingham Massachusetts

Existing Conditions for Drainage Area O6 Toni and Jamie Drive cul-de-sacToni and Jamie Drive are two streets in a neighborhood consisting ofsingle family residences. This drainage area has less than two acres ofimpervious surface. Catch basins direct runoff to a large detention pondlocated on the eastern edge of the drainage area. The pond overflows toa tributary that flows into Drainage Area O18. In the spring of 2011, thedetention pond was over run with invasive Japanese Knotweed (photobelow), posing a serious threat to the adjacent wetlands.Existing detention pond located in Drainage Area 06Site DetailsDrainage Areas (acres) 4.9Impervious Area (acres) 1.2Land UseLow DensityResidentialHydrologic Soil Group(at proposedstormwater controlsite)Existing PhosphorusLoad (lbs/yr)B1.5Japanese knotweed, an invasive species, growing in existing detention pondData Sources: MassGIS, Town of Bellingham,CRWA, NRCS, EPA11