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<br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />total of the most senior water rights of the river is 3 cubic feet of water <br />per second of time (cfs) and the river is only flowing at 2.5 cfs, then the <br />senior users would receive only 2.5 cfs and all junior Big Thompson water <br />rights owners might receive no water at all. The City may own a large <br />percentage of the water rights on the river via direct flow rights and <br />ownership in ditch companies, but the actual quantity of water made <br />available to the City will depend upon 1) the actual flowrate in the Big <br />Thompson River, and 2) the extent to which senior water rights owners have <br />received their allotted flows if they called for them. <br /> <br />I <br /> <br />A computer model was developed to compute water allocations for the <br />individual water rights on the Big Thompson River. The 1,000 year Big <br />Thompson streamflow record (from Task 2) was processed by the model to <br />produce a similar duration record of the quantity of water that would be <br />available to the City on a monthly basis from all City supply sources on <br />the Big Thompson. <br /> <br />I <br />I <br /> <br />I <br /> <br />The supply available from CBT is more difficult to estimate in any given <br />month because that supply will depend not only on existing CBT storage and <br />the inflow to the system but also upon demands from the entire Northern <br />Colorado Water Conservation District and the annual quota set for CBT <br />units. The operational model of the CBT system developed as part of Task 3 <br />was used to enable consideration of these factors in the analysis of the <br />City'S supply. The 1,000 year record of CBT inflows was then processed by <br />the model to estimate the availability of water to the City. <br /> <br />I <br />I <br />I <br />I <br /> <br />The supply available from Vindy Gap in any given month is a function of <br />existing storage, the inflow to the project, required maintenance of <br />instream flows downstream of the project, and available storage capacity in <br />Lake Granby. The operational model of the Vindy Gap system developed in <br />Task 4 considers these factors in the analysis of the City'S available <br />supply. The 1,000 year record of CBT inflows (as described in Section 6.0) <br />was used in the model to estimate Vindy Gap water availability. <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />8-6 <br />