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4.4 Crop Distribution File (rg2004.cds) <br />The crop distribution file contains acreage and associated crop percentages for each key, <br />aggregated, and ground water only structure for every year in the analysis period (1950 <br />through 2002). The 1998 acreage and crop types were determined during the Irrigated <br />Acreage Assessment performed by Agro Engineering, Inc. as part of the Consumptive <br />Use and Water Budget component of RGDSS. Irrigated acreage was assigned to a ditch <br />system structure identifier based on service area locations, as described in the 1998 <br />Irrigated Lands Assessment Using Satellite Imagery in the Rio Grande Basin of <br />Colorado, Agro Engineering Inc., July 2000. Parcels without a surface water source were <br />assigned to ground water only aggregates, as described in the Task 8.1 Review Well and <br />Lands Served by Ground Water Only memorandum, developed by the Surface Water <br />Contractor. Acreage for aggregated diversion structures was determined by adding the <br />acreage of the individual structures making up the aggregate, as described in the Task 7.1 <br />A~~re~ated Water Rights/Irrigated Lands Not Explicitly Modeled memorandum, <br />developed by the Surface Water Contractor. <br />The 1998 irrigated acreage assessment focused on defining acreage in the floor of the San <br />Luis Valley. Acreage outside the valley floor was defined where possible, but in some <br />areas it was difficult to distinguish irrigated acreage from forested areas, or acreage could <br />not be defined due to cloud cover. There are 108 structures with current diversions for <br />irrigation where acreage could not be defined, 14 of these structures have been defined as <br />"key" and the remaining are included in aggregates. For these structures, user-defined <br />acreage reported in the diversion record database for 1998 was used. <br />Table 6 summarizes the 1998 acreage used as a basis for historic consumptive use <br />estimates by source. Table 7 summarizes the 1998 acreage by crop type. Table 8 shows <br />the acreage by water district. Acreage and crop mix by structure are detailed in the 1998 <br />Irrigated Lands Assessment Using Satellite Imagery in the Rio Grande Basin of <br />Colorado, Agro Engineering Inc., July 2000. Note that refinements were made to the <br />original 1998 coverage documented during the subsequent peer review process, as <br />described in the RGDSS Ground Water Phase 4 Task 36 Irrigated Acreage Update, Ray <br />R. Bennett, May 12, 2005. <br />Table 6 <br />1998 Irrigated Acreage by Source <br />Acrea e Source Acrea e <br />1998 Irri ated Acrea e Assessment 615,092 <br />1998 Division 3 Diversion Records 7,776 <br />Total Basin 622,868 <br />cureport_6-2004.doc 22 of 48 June, 2004 <br />