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<br />. <br /> <br />. <br /> <br />Task 2.2 Calculate Headgate Demands based on Minimnm Structure Efficiencies <br />Determine the minimum structure efficiency by month for the period 1909 through 1996. <br />Estimate calculated headgate demand to be monthly irrigation water requirement divided by the <br />minimum efficiency for the structure. <br /> <br />Coordinate with R Ti to enhance demandts to perform the calculations and create the diversion <br />demand file (*ddm). <br /> <br />Task 2.3 Calculate Headgate Demands based on Structure Water Rights <br />Estimate the calculated headgate demand to be the sum of the active water rights when a <br />consumptive irrigation water requirement exists under the structure during each year for the <br />period 1909 through 1996. Set the calculated demand to zero during the non-irrigation season <br />when there is no irrigation water requirement. <br /> <br />Coordinate with RTi to enhance existing data management interfaces (DMls) or the State to <br />enhance StateMod to perform the calculations and create the diversion demand file (*.ddm). <br /> <br />Task 2.4 Calculate Additional Headgate Demands based Tasks 2,1 through 2.3 and Technical <br />Review Sessions <br />A Technical Review Session will be held to present and discuss the demands calculated in Task <br />2.1 through 2.3. It is anticipated that up to two (2) additional methods for calculating demands <br />will be considered based on this presentation and discussions. These demands will be developed <br />and included in the final demand comparison memorandum. <br /> <br />Coordinate with RTi to enhance existing data management interfaces (DMls) or the State to <br />enhance StateMod to perform the calculations and create the diversion demand file (*.ddm). <br /> <br />Task 2.5 Compare Calculated Demands and Historical Diversions <br />Prepare graphs showing historic diversions, calculated demands using the current CRDSS <br />methodology, and calculated demands determined in Tasks 2.1 through 2.4. Identify potential <br />limitations associated with each methodology and discuss issues relating to, but not limited to, <br />the following: <br />Free water rights <br />Supplemental ground water supplies <br />Supplemental reservoir supplies <br />Diversions for stock <br />Dry, average, and wet year results <br /> <br />Prepare a memorandum describing the results of the comparison, showing graphic <br />representations of the calculated demands, and providing a recommendation for one (1) <br />calculated demand methodology to be used in Task 3 analyses. After State review, address <br />comments and concerns in the final memorandum. <br /> <br />TASK 3 - SIMULATE CALCULATED YAMP A STA TEMOD MODEL WITH VARIABLE <br />EFFICIENCY AND SOIL MOISTURE ACCOUNTING <br /> <br />Task 3.1 Run Calculated Monthly Yampa River Basin StateMod Model <br />Run the monthly calculated Yampa River Basin model with the irrigation water requirement file <br />(*ddc) created in Task 1.2, the baseflows developed in Task 1.3, and the calculated demands <br /> <br />C:\Cdss\statemod\Variable eft evaluation contract_ 4.doc <br /> <br />Page 13 <br />