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WHPZ are usually circular, with a radius of 500 metres in P1 areas and 300 metres in P2 and P3 areas. WHPZ do not extend outside PDWSA boundaries. RPZ consist of a 2 kilometre buffer area around the top water level of storage reservoirs and include the reservoir itself. A reduced buffer area may be applied where the reservoir is designed only for short-term storage of collected water (eg. pipehead or pumpback dams)before transfer to a main storage reservoir. Reservoir protection zones are normally only designated over Crown land and generally prohibit public access to prevent contamination (physical, chemical and biological) of the source. Reservoir protection zones do not extend outside PDWSA boundaries (eg. down stream of dam wall). 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