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<br />. <br /> <br />Objective: Specify the modeled timing and location of return flows resulting from diV'ersions by the <br />aggregated irrigation structures, and prepare the StateMod .rtn input file. <br /> <br />Asswnptions: Return flow timing will be specified as one of three patterns used in the Phase II model. <br />Inclusion of aggregated structure nodes in the model will not impact the return flow location of Phase <br />II diversions. <br /> <br />Approach: <br />1: RTIWR: For each aggregated irrigation structure, select one of the three return flow patterns to <br />represent timing of return flow, The selection, which will be subjective, will be based on proximity to <br />a channel that can conduct water back to the river. <br />2. STATE: For each aggregated structure, select a return flow node based on inspection of the maps <br />produced in Task 2.02. In most cases, the next downstream node will receive all retwn flows; <br />however, there may be cases in which flow enters the stream further downstream or at more than one <br />site. It is anticipated that these special cases will represent approximately 10 percent of the new <br />aggregated structures. <br />3. RTIWR: Manually edit the Phase II .rtn file to include special cases of return flow timing(?) and <br />location, <br />4, STATE: Prepare a Task Memorandum summarizing how all special cases for return flow arc <br />represented in the model. The memo will be approximately 3 pages or less in length. <br /> <br />. <br /> <br />Deliverable: <br />I. Return flow lag patterns assigned to each aggregated structure. <br />2. Retwn flow nodes assigned to each aggregated structure, <br />'3. StateMod input file (*,rtn) file. <br />4, Task memo <br /> <br />Task 2.07 <br /> <br />Generate Aggregated Parameters <br /> <br />Objective: For each aggregated node, calculate total or representative values for these structure <br />attributes: administration nwnber, ditch capacity, and irrigated acreage served, Create StateMod ,ddr <br />and interim .dds files that include the aggregated irrigation structures, <br /> <br />Prerequisite: A Watright enhancement will be available to determine aggregated parameters for the <br />aggregated structures and rights. These parameters include combined ditch capacity and flow-weighted <br />administration nwnber. Watright will generate a report listing the original structures and water rights <br />by aggregation grouping, and the total ditch capacity, weighted administration nwnber, and total <br />irrigated acreage for each grouping. It will also create .dds and .ddr files for the aggregated structures. <br /> <br />Approach: <br />1. R TIWR: Run watright for the entire White River Basin using a command file. The command file <br />.' will include the explicitly modeled structures from Phase II as well as the aggregated groups. The <br />, command file will also include the 10 administration number classes as input. <br />2, STATE: Document in a draft memo the determination of aggregated parameters for the aggregated <br />structures. The 1-2 page memo will include the basin summary report generated by watright. RTi <br /> <br />1173 <br /> <br />Phase Illa Scope of Services <br /> <br />A.ll <br /> <br />1an31,1997 <br />