In addition to the zoning districts as delineated on the Official Zoning Map, the Township of Hampton is hereby divided into a series of overlay districts, the boundaries of which conform to the edges of watersheds and watershed sub-basins within the Township. The boundaries of the districts are graphically shown on the map titled "Plate 1, Allegheny County Stormwater Management Plan, Girty's Run, Pine Creek, Deer Creek, Squaw Run," a part of the Allegheny County Stormwater Management Plan for the Pine Creek and Deer Creek watersheds, which map is adopted by reference as part of this chapter.