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~. ~ <br />-~ <br />~.~~ <br />the GIS and Consumptive Use contractors in order to ensure that the necessary data is being <br />developed for the consumptive use analysis tasks outlined in Task 74 of this Scope. Note that <br />this Task was started during Phase 1 and continues into this phase. <br />Objective: <br />Coordinate with the GIS contractor to determining the extent and character of irrigated lands in <br />the South Platte and North Platte River Basins and their tie to water supplies. Providing technical <br />guidance and review of work products. Review fina12001 irrigated acreage coverage and key <br />structure service area assignments. Review three historic irrigated acreage "snap shot" <br />coverages. Provide technical guidance to determine historic irrigated acreage under inactive <br />ditch systems. <br />Approach: <br />52.1 Coordinate with the GIS contractor and provide technical guidance during the completion <br />of the 2001 irrigated acreage coverage, by reviewing the final coverage. Review the three <br />historic irrigated acreage coverages. Provide technical guidance to RTi to determine <br />appropriate surface water source assignments to parcels in historic coverages under <br />transferred ditch systems. It is anticipated that decrees and engineering reports supporting <br />the transferred water rights will be reviewed to assist with this task. Up to six (6) full-day <br />meetings are anticipated. <br />Deliverables: <br />52.1 A memorandum that documents the results and recommendations of the review of final <br />2001 irrigated acreage coverage and key structure service area coverage, and the review <br />of three historic irrigated acreage coverages. <br />Task 56 -Develop Conveyance and Application Efficiency Estimates <br />Background: <br />StateCU allows both conveyance efficiency and maximum application efficiency to be specified <br />for each ditch system or aggregated land systems. In addition, StateCU allows different <br />allocation methods used by irrigators with both surface and ground water supplies to be <br />specified. The first method widely used is termed the "mutual ditch" approach, where surface <br />water is allocated based on irrigated. acreage under a ditch system and ground water is used as a <br />_ _ supplemental_source. The second metl~osi_~s~d is .termed_the_"xnazs~imi~e supply"-approach,-. - <br />whexe ground water is used to meet demand on sprinkler-irrigated lands up to the permitted <br />pumping capacity, surface water is used first on lands without a ground water supply, then excess <br />surface water is used on flood-irrigated lands with both a surface water and ground water supply. <br />Ground water is allocated, as necessary, to meet deficits on flood-irrigated lands with a ground <br />water source. Based on interviews during SPD5S Phase 1, it appears that most ditch systems in <br />the South Platte operate under a "mutual ditch" type of approach. <br />Objective: <br />Develop conveyance and application efficiency estimates required for supply-limited <br />consumptive use estimates over the SPDSS study period. Estimate the appropriate water <br />Exhibit A-1Page 12 <br />