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Ground Water Only Structures: Irrigated parcels, totaling 57,996 acres, did not <br />fall within a ditch system service area and were determined to have ground water <br />as the only supply source. These parcels were combined into aggregated groups <br />based on location to be consistent with the Unit Response Function (URF) zones <br />defined by the Rio Grande Ground Water Contractor. <br />Available soil moisture capacities are assigned to individual structures in the structure <br />file. Available soil moisture capacities were determined using Colorado STATSGO <br />mapping and irrigated acreage parcel locations, as described in the Rio Grande Historic <br />Crop Consumptive Use -Soil Moisture Capacities memorandum, included in Appendix <br />C. Soil moisture capacities for each structure, in inches of holding capacity per inch of <br />soil depth, were provided to the Relational Database Contractor and stored in HydroBase. <br />Table 4 summarizes the range of soil moisture capacities used in the consumptive use <br />analysis by County and HUC combination. <br />Table 4 <br />Average Soil Moisture Capacity (inches/inch) <br /> <br />HUC <br />County Average Soil <br />Moisture Capacity <br />inches/inch <br />13010001 Mineral 0.1255 <br /> Rio Grande 0.1255 <br />13010002 Saguache 0.1771 <br /> Rio Grande 0.1771 <br /> Alamosa 0.1142 <br /> Costilla 0.1130 <br /> Conej os 0.1073 <br />13010003 Sa uache 0.0770 <br /> Rio Grande 0.0739 <br /> Alamosa 0.0869 <br /> Costilla 0.0869 <br />13010004 Saguache 0.1226 <br />13010005 Conejos 0.1099 <br />13020101 Costilla 0.0852 <br />Climate station assignments were made to county/HUC combinations and provided to the <br />Relational Database Contractor for inclusion in HydroBase. These assignments, included <br />in the structure file, provide the link between structures (diversion, aggregated, and <br />ground water only) and the climate stations to be used when determining the structure's <br />irrigation water requirements. Figure 7 shows the county and HUC outlines, as well as <br />the location of climate stations. <br />cureport_6-2004.doc 19 of 48 June, 2004 <br />