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The zones describe the area within which an activity might reasonably be expected to impact upon the quality of water at the abstraction point.The extent of the source protection area was defined by the \u2018run time\u2019 it would take water entering the stream to reach the abstraction point. Different catchments have different run times based on catchment characteristics. The catchment drinking water supply protection zone is a 200 m wide buffer overlaid on this defined river-run extent. More information can be found in the report:Thompson, M. (2015), Delineation of drinking water supply catchment protection zones (surface water): Method to support the Proposed Natural Resources Plan. Unpublished Greater Wellington Regional Council report, 22p, WGN-DOCS-#1442059. 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