Description: The Source Water Assessment and Protection Program (SWAPP) is designed to provide proactive planning and protection of public drinking water supplies.The SWAPP data set provides a three-tiered polygon delineation of the areas of contribution to drinking water intakes on streams, rivers, lakes and reservoirs.Zone 1 (Critical Zone) begins ¼ mile below the intake site and extends 5 miles upstream of the intake. Zone 2 (Zone of Responsibility) extends the protection area to 10 miles above the intake. Zone 3 (Zone of Potential Impact) extends to 25 miles above the intake or to the hydrologic boundary.This data set is published as one merged statewide data set, to show spatial extent of coverage (i.e. where protection zone 3 areas overlap, the individual polygons are merged).
Description: Each Watershed Planning Area is based on a delineated watershed that is identified by a 10-digit, 12-digit or 14-digit Hydrologic Unit Code (HUC) defining its drainage area. Watershed Planning Areas are determined through the watershed planning process; the watershed is studied to decide what areas need what type of action to address nonpoint source pollution for each particular watershed. Data beneficial to watershed planning efforts can be found in the attribute table.
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