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design for average day demand (ADD), and <br />peak periods of demand such as maximum <br />day demand (MDD), and peak hourly <br />demand (PHD) that are based upon actual <br />metered water use records. The data <br />collected shall be sufficient to account for <br />seasonal or other cyclic changes in water <br />demand, and shall correlate to the <br />maximum number of full-time or part-time <br />equivalent residential units in service at any <br />time. <br />(2) For seasonally used, transitory non- <br />community, or recreational developments <br />the design for ADD, MDD, and PHD shall <br />be based upon metered water uses <br />whenever such data is available. The data <br />must account for the daily population using <br />the water over the time that records are <br />collected, and must reflect the uses <br />associated with maximum occupancy for <br />the development. The design demands for <br />these developments apply only to part-time <br />uses, and may not be applied to structures <br />or dwellings that can be permanently <br />occupied. <br />(3) In the absence of metered use or <br />other comparable information, the <br />following sources of design information <br />maybe used: <br />(a) Comparable metered water use data <br />from analogous water systems. Analogous <br />systems are those with similar <br />characteristics, such as demographics, <br />housing sizes, income levels, lot sizes, <br />climate, water pricing structure, water use <br />efficiency practices, use restrictions, and <br />soils and landscaping; or <br />(b) Design criteria or guidelines in the <br />most recent edition of the department <br />manual for design of Group A public water <br />systems. <br />27