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12 <br />mapped. 7'he uncectainties axe so gieat ChaY a me~e 6 peicent of system c~wi~eis were <br />able to calculate their capital needs ivith any degree of confidence. For this reason, <br />projections Por stormwaYer inveshnenYS ($1.47 billio~~) rnay be less reliable than those <br />for water and sewer systems. Adjust~nents, however, are moce likely to increase rather <br />than decrcase the future needs. <br />Localities are moving toward regionalizatian faster with water service than with sewer <br />servite. <br />Slightly more than half of all water systems have some interconnection with other <br />systems and those interconnerted systems serve nearly 80 percent of all people on <br />public water systems.'Itvo forces appear to be dciving regionalization of water systems: <br />the search for more mst-efficient operations and the need for back-up in times of water <br />shortages. Widespread iegionalization in the east may be related in part to the sheer <br />number of systems in the east and in part to the flat terrain, which reduces the <br />obstacles to laying pipe uver long distances. Piedmont water systems, huwever, <br />increased their intereonnections following the drought of 2002. Ureensboro alone <br />has ll interconnections. <br />G`~i <br />Phase I and II Designated Municipalities by County <br />Natlonal Pollution Diuharge Elimination System Program <br />