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i r ~ ~~~~ <br />M 2 <br />The assignment of soil water holding capacities to a structure is required as part of a supply- <br />limited consumptive use in StateCU and for simulating soil moisture use in StateMod. A new <br />GIS-based DMI is being developed in this Scope under Task 18 that will automate the <br />assignment of soil moisture holding capacity to a key or aggregated structure. <br />Objective: <br />Document the estimate of soil water holding capacities for key model structures, aggregate <br />structures, and ground water only structures in the South Platte and North Platte River Basins. <br />Approach: <br />57.1 Document the use of the new GIS-based DMI, developed in Task 18, to perform an <br />intersection of GIS irrigated acreage coverages (2001 and historic coverages) with the <br />statewide soil moisture coverage developed under previous CDSS efforts to determine the <br />average soil moisture characteristics for key and aggregated structures (includes ground <br />water only aggregates). The digital results will be provided to the State's HydroBase data <br />manager. <br />57.2 The structure file (*.str) used to define non-time series information for each key and <br />aggregate structure modeled in the historic consumptive use model contains information <br />regarding structure location, climate station assignments (determined in Phase 1), and <br />available water capacity. Using StateDMI, create the structure file required for the <br />StateCU historic consumptive use analysis. <br />Deliverables: <br />57.1 A technical memorandum that describes the results and provides astep-by-step procedure <br />for assigning available water holding capacity to key and aggregate structures using the <br />new GIS-based DMI. The memorandum will include maps showing soil polygons and <br />associated available water capacity and statistics by water district, drainage area, and total <br />study area. This technical memorandum is expected to an appendix in the final Historic <br />Crop Consumptive Use Report. The command file used in the GIS-based DMI will be <br />provided to the State. <br />57.2 The StateDMI command file required to create the structure file (*.str) and the final <br />structure file required for StateCU. <br />- - - _ Ta~l~ 64 - Deyel4g I'~'~~i.Ri~~~ U~~stim~~ - - - - - - - - - - - - - - - - - - - - - - - - <br />Background: <br />The quantity of precipitation that recharges an aquifer should be consistent with other uses of <br />precipitation (e.g. the amount consumed by irrigated and native vegetation, losses, held in <br />storage, and runoff). <br />Objective: <br />Review the published information for the basin and western United States on precipitation <br />recharge to groundwater aquifers. Develop precipitation recharge,estimates for the SPDSS study <br />area that are consistent with estimates of precipitation used to meets crop and native vegetation, <br />Exhibit A-1Page 14 <br />