The intent of the Watershed Protection District is to include lands lying adjacent to watercourses and surface water bodies which create the catchment or drainage areas of such watercourses and bodies, as part of their natural drainage system. The Watershed Protection District includes all streams, brooks, rivers, ponds, lakes, named or unnamed, and other bodies of water shown on the plan entitled "Norfolk, Massachusetts, Planimetric Survey," dated 1964, prepared by New England Survey Services, Inc., Civil and Consulting Engineers, Boston, Massachusetts (scale one inch equals 2,000 feet), prepared under the direction of the Board of Assessors and used as a base plan for the Assessors maps revised through the fiscal year 2002 and kept on file with the Norfolk Board of Assessors. These maps, which are on file in the offices of the Town Clerk and Board of Assessors, establish and depict this overlay district and include all land lying within a horizontal distance of 25 feet from the mean annual high-water line and from adjacent low, marshy areas of all brooks, streams, rivers, lakes, ponds, marshes, swamps and bogs.