This point datalayer contains spatial and attribute information of stormwater drainage outfalls in urbanized areas owned by the Massachusetts Department of Transportation (MassDOT). The datalayer was created in an effort to maintain compliance with the requirements of the NPDES MS4 General Permit issued by the U.S. Environmental Protection Agency (EPA) for storm water.
Outfalls were identified using two main processes, reviewing drainage plans and performing field investigations. All available MassDOT construction and as-built plans showing stormwater infrastructure were compiled and georeferenced in GIS. Outfalls were then digitized, capturing spatial information and design characteristics stated on the plans. Where no stormwater drainage plans were available, field-teams manually located outfalls using hand-held GPS.
In addition to the main plan review and field investigation, outfalls were located during illicit discharge detention and elimination (IDDE) field surveys performed in 2008 and 2010 and during impaired waters assessments performed in 2011 under the Impaired Waters Program. The resulting datalayer includes MassDOT outfalls in urbanized areas across the state of Massachusetts.
This data is current as of May 2012.
(pGDB - 1.3 MB)