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Definitionsa. General definitions. The following definitions, relating to all water supplies, are established.(1) Water works. All construction (structures, pipe, equipment) required for the collection,transportation, pumping, treatment, storage anddistribution of water.(2) Supply works. Dams, impounding reservoirs, intake structures, pumping stations, wells andall other construction required for the development of a water supply source.(3) Supply line. The pipeline from the supply source to the treatment works or distributionsystem. (4) Treatment works. All basins, filters,buildings and equipment for the conditioning of water to render it acceptable for a specific use.(5) Distribution system. A system of pipes and appurtenances by which water is provided fordomestic and industrial use and firefighting.(6) Feeder mains. The principal pipelinesof a distribution system.(7) Distribution mains. The pipelines thatconstitute the distribution system.(8) Service line. The pipeline extendingfrom the distribution main to building served.(9) Effective population. This includes resident military and civilian personnel and dependentsplus an allowance for nonresident personnel, derived as follows: The design allowance for nonresidents is 50 gal/person/day whereas that for residents is 150 gal/person/day. Therefore, an "effective-population" value can be obtained by adding one-third of the population figure for nonresidents to the figure for residents.Nonresident Population Effective Population =3 + Resident Population(10) Capacity factor. The multiplier whichis applied to the effective population figure to provide an allowance for reasonable population increase, variations in water demand, uncertainties as to actual water requirements, and for unusual peak demands whose magnitude cannot be accurately estimated in advance.The Capacity Factor varies inversely with the magnitude of the population in the water service area.(11) Design population. The populationfigure obtained by mult