Town Center Subbasin Study Report - Bellingham Massachusetts

Existing Conditions for Drainage Area O28: Town Hall/Parking LotThis area consists of a town-owned parcel where the Bellingham historictown offices, police station, municipal building and Historical Museum arelocated. Situated near the intersection of Rtes. 126 & 140, and across froma Walgreens pharmacy, this area sees a lot of vehicular and pedestriantraffic. Most of the site is impervious. The grade drops off steeply behindthe buildings and the entry point to most buildings is at-grade, suggestingthe potential for flooding at the buildings’ entrances.Water from drainage areas O28 and O24 are directed to two catch basinson the southeastern edge of the parking area. This water is piped to anoutfall at the toe of the slope behind Walgreens. Here, water is collected ina small detention pond that is lined with rip rap.Site DetailsDrainage Areas (acres) 3.0Impervious Area (acres) 2.2Land UseCommercialHydrologic Soil Group(at proposedstormwater controlsite)Existing PhosphorusLoad (lbs/yr)A4.37Data Sources: MassGIS, Town of Bellingham,CRWA, NRCS, EPA13Stormwater runoff from Drainage Area 028 drains to an existing detention pond locateddown slope from the Walgreens parking lot (DA 028A)