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, r s <br />Because none of the 24 project components considered could individually meet future water <br />demands, it was necessary to combine various project components into "portfolios of <br />projects" to provide a long-term water supply solution. Each of the seven potential project <br />portfolios included phased implementation of selected projects to meet the City's increasing <br />water demands. Project phasing was based on meeting projected dry year water demands at <br />least five years before the demand occurs. <br />Figure 1 below shows the portfolio that was determined to best meet the evaluation criteria. <br />The evaluation shows that the first project that should be constructed to meet near term <br />water demand is the Prairie Waters Project. The Prairie Waters Project will put the City <br />ahead of the demand curve for several years and provide "drought hardening' of the <br />existing system. <br />t�a.o <br />14U.0 <br />120.0 <br />1 t�f1.0 <br />y <br />g <br />c> <br />.� 8q.0 <br />a <br />v <br />� <br />v <br />`v <br />d <br />60.0 <br />40.0 <br />20.0 <br />Q.0 <br />0 o c�a '- m �.n tr oti m �n r. G, rn �.n r. c� m�} cn t� rne� <br />4 O � Cyl O O O L] O C7 O p C7 O C1 O O C7- C'�] O Q O CS <br />N fV N �'+f ?�3 tV r+l N N !V N cV N N N +V N f"V f�l fV N f'V N <br />FIGURE 1. AURORA WATER DEMAND AND YIELD COMPARISON (MWH, 2004) <br />To meet the demands of its existing customers in dry years, and to meet the increasing <br />demands on the system in the future, the goal of the PWP is to supply 10,000 acre-feet of <br />water per year (ac-ft/yr) by 2009-2010 and 15,000 ac-ft/yr by 2012-2013. Aurora Water will <br />accomplish this goal using reusable effluent from its existing portfolio of decreed reusable <br />water rights, supplemented by lawn irrigation return flows and junior water rights. <br />4 <br />