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Demand Pattern (150,000 af Yield) <br />40,000 <br />35,000 <br />30.000 <br />25,000 <br />w <br />L 20,000 <br />u <br />ce <br />� 15,000 <br />I 0,000 <br />5,000 <br />0 <br />Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec j <br />M onth <br />❑ Power ■ M&I O Irrigation � Fish Release <br />Figure EL Modeled Demand for Grand Valley Lake (Large Reservoir) Operations Analysis <br />Firm yield for the smaller reservoir impounded by dam Alignment 2 was shown to be 54,500 af, and <br />there was no benefit to increasing diversion capacity above 1 I S cfs. Smaller diversion capacities and <br />firm yields were not explored because meeting the OMID demand (58,300 af/yr) seems to be a <br />reasonable threshold for viability of the project. When annual demand is set to 58,300 af/yr, it can be <br />met in every year of the 31-year modeling period, except for 1977, when it delivers approximately <br />51,000 af. Whether this represents an acceptable level of risk to OM1D is not known. <br />The reservoir capacity which is equal to the water in storage at the beginning of the critical period, is too <br />small for the total volume of the deficit with respect to demand over the critical period. Therefore, <br />increasing the diversion capacity from 1 15 cfs provides no benefit because during the critical period, <br />legally available water does not exceed this amount. <br />4 <br />AECOM <br />2/22/10 <br />