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<br />a monthly basis wherein the annual demand will be converted to a monthly hydrograph and run <br />against historic yields from the above water rights. <br /> <br />This model will be capable of simulating on a monthly basis anticipated yields from City water rights <br />during the various hydrologic cycles represented in the historic record, directing water rights flows <br />into storage vessels, accounting for evaporation and seepage, and identifying yields of projects in <br />order to indicate the City's ability to withstand historic droughts of varying magnitude and duration <br />with its water rights portfolio. <br /> <br />Input will be based upon historic stream flows and ditch diversions (using the SEO electronic <br />diversion records) linked with the City's monthly demand hydrographs in a spreadsheet format. Input <br />will also include: the capacities of the City's physical conveyance system, the City's current and <br />anticipated ownership of water rights and the capacity of other conveyance facilities routinely used by <br />the City in the conveyance of its raw water. All values will be in acre feet, or a flow rate in cubic <br />feet per second. Output will be in spreadsheet form identifying demands met from direct flow rights <br />or storage releases. Water surpluses will go to storage where space is available or be spilled. <br />Monthly and annual totals will reflect average, minimum and maximum usage, yields, surpluses, <br />spills, and return flow credits (where applicable). <br /> <br />Flexibility will be built into the model to allow specific years of the historic period to be simulated; <br />expansion of current water rights ownership, conveyance improvements, or the addition of storage <br />facilities; the acquisition of additional water rights; or inclusion of a project which adds raw water <br />supply to the City's system. The additional raw water supply may be specified by the user as <br />individual monthly values for the entire simulation period or as annual values which may be used in <br />any fashion during a given year on an as-needed basis (e.g., annual C-BT quotas). <br /> <br />4.0 EVALUATE EXISTING RAW WATER SUPPLY SYSTEM <br /> <br />Using the computer model developed in Task 3.0, the Consultant will. evaluate the reliability of the <br />City's existing system under the three water demand scenarios. This assessment will indicate the <br />ability of the City's currently owned water rights to meet existing and two future demand scenarios <br />under a variety of runoff conditions and the drought condition. 'It will also show the "level of <br /> <br />A-4 <br /> <br />196\ub_a.TX'T <br />07\23\91 mlb <br />