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The focal point of a SWP program is the surface water time-of-travel delineation and the resulting map. The protection zones are defined as a three-tiered system - Zone A, B, and C. Zone A is an area ¼ mile wide on either side of the river or stream. It extends from an area ¼ mile downstream of the intake to an area that is 5-hour time of travel (TOT) upstream. Zone B is a two mile wide area on either side of the river or stream, extending upstream to a 25-hour TOT. Zone C is the remainder of the watershed, but can be refined by consideration of river hydraulics to determine channeled flow and critical contributing tributaries. 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