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<br />0003J7 <br /> <br />ground water. This estimate considers al I communities with a population <br />in excess of 100 having a centrai supply system and al I of those now <br />with systems, even though their population is less than 100. It also <br />considers a future water usaae rate at least equal to the use rate <br />estabiished for the state Water Plan. The present usage rate was used <br />for the systems with rates hioher than the established future use rate. <br />In addition, the usage for each system was increased 80 gallons per <br />capita as a reserve for minor industrial plants which may be connected <br />to the system. This industrial reserve amounts to about 30 percent <br />of the projected withdrawal for each of the planning periods. <br /> <br />The future projected requirements by basins for the three selected <br />planning years are shown in Tables 3, 4 and 5. The big increase in <br />projected usage over present usage is caused by (1) assuming instal- <br />lation of 16 additional central supply systems, (2) adjusting usage <br />rates for the present low users up to the established future per capita <br />water use rates, and (3) the reserve for industrial use. The additional <br />Quantities reserved for industrial use alone amount to 114,000 acre-feet <br />for 1980. 137,500 acre-feet for 2000, and 163,000 acre-feet for 2020. <br /> <br />The biggest increase in projected needs is in the flissouri Trib- <br />utaries River Basin, including the Omaha Metropol itan Area, where the <br />2020 requirement is expected to be nearly four times the present usage. <br />The Lower and Middle Platte River Basins fol low in order with approxi- <br />mately 270 and 190 percent increases in need respectively. <br /> <br />Future water requirements for municipal systems by stream reaches <br />are included in Attachment 2. Included are projected usages from <br />private industrial systems. The non-municipal system withdrawals are <br />included because of the possibi lity of mutual interference between <br />systems in the event the source of supply becomes inadeouate. <br /> <br />Qual ity <br /> <br />Raw water sources, principally ground water, are generally expected <br />to remain at the present quality. This is contingent upon the prudent <br />use of ferti lizers, pesticides, etc., and the effective regulation of <br />both natural and man-made sources of pollution. Local quality problems, <br />particularly where the water table is near the surface, may be increas- <br />inglyevident. Water quality is discussed further in Chapter 6. <br /> <br />14 <br />