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<br />1047 <br /> <br />- <br />Subtask 3.08 Assign Aggregated Irrigation Efficiencies <br /> <br />Objective: Estimate irrigation efficiency for the aggregated structures and update the Statemod <br />. dds input file. <br /> <br />Prerequisite: Demandts will be modified to calculate average efficienl;y for diversion structures <br />specified by the user. <br /> <br />Assumption: The acreage-weighted average of irrigation efficiencies for explicitly modeled <br />structures represents irrigation efficiency adequately for aggregated structures, <br /> <br />Approach: <br />1. Boyle: Execute demandts to calculate acreage weighted average monthly irrigation <br />efficiency for Phase II structures with diversion records. <br />2. Boyle: Manually update the .dds file to incorporate efficiency estimates. <br />3. Boyle: Prepare a Task Memorandum summarizing the process and results of this task, The <br />memo is expected to be approximately 2 pages in length. <br /> <br />Deliverables: <br />1. Acreage weighted average monthly irrigated efficiency. <br />2. Updated Statemod input file (.dds) incorporating aggregated efficiency estimates. <br />3. Task Memo <br /> <br />Subtask 3.09 Generate New .ddm and .ddh Files <br /> <br />Objective: Prepare Statemod ,ddh and ,ddm input files, The .ddh file will contain historical <br />diversions for Phase II structures and calculated demands for aggregated structures. <br />The .ddm file will contain calculated demands for all irrigation structures, <br /> <br />Prerequisite: Demandts will be modified to sum the irrigation time series for individual structures <br />represented in aggregated fashion. <br /> <br />Assumption: Historical diversion records for small irrigation structures are generally incomplete or <br />inadequate for modeling demand, For the aggregated structures, demand at the <br />headgate will be calculated by estimating consumptive use for all associated irrigated <br />acreage, and dividing by estimated efficiency, <br /> <br />Approach: <br />1. STATE: Prepare ASCII files that list the County/HUC for each structure in the Yampa <br />River Basin, <br />2. Boyle: Prepare a temporary or working .dds file for every structure tied to an irrigated <br />parcel, Le" for both explicitly modeled structures and the individual structures that are <br />being aggregated <br /> <br />Phase IlIa Scope of Services <br /> <br />A-33 <br /> <br />June 12, 1996 <br />