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RGDSS_Historic_CUreport_20040601
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Last modified
4/17/2013 10:08:47 AM
Creation date
5/27/2008 2:11:23 PM
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Decision Support Systems
Title
RGDSS - Rio Grande Historic Crop Consumptive Use Analysis
Description
The documentation is for the Rio Grande Basin Historic Crop Consumptive Use Analysis, developed during the RGDSS implementation for the period 1950 through 2002. It includes 100 percent of the crop consumptive use in the basin for the period. Documentation consists of the final Historic Crop Consumptive Use Analysis Report and supporting appendices.
Decision Support - Doc Type
Modeling Dataset Documentation
Date
6/1/2004
DSS Category
Consumptive Use
DSS
Rio Grande
Basin
Rio Grande
Contract/PO #
C153863
Grant Type
Non-Reimbursable
Bill Number
HB98-1189, SB99-173
Prepared By
Leonard Rice Engineering
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water supply that use sprinklers, and to meet any remaining requirement on lands that <br />flood irrigate and also have ground water supply. For the Rio Grande Basin historic <br />consumptive use analysis, the "maximize supply" option was chosen for all structures. <br />Two BASIC language pre-processor programs, developed under this subtask, were used <br />to create the Crop Distribution and Annual Time Series input files (sprink.bas and <br />wellproc.bas). The data management interface StateDMI will be used to create future <br />input files for the Rio Grande Basin historic consumptive use analysis scenario. <br />Approach and Results <br />Generate Irrigated Acreage Time Series <br />The crop distribution file (rg2004.cds) contains acreage and associated crop percentages <br />for each key, aggregated, and ground water only structures for every year in the analysis <br />period (1950 through 2002). The 1998 acreage and crop types were determined during <br />the Irrigated Acreage Assessment performed by Agro Engineering, Inc. as part of the <br />Consumptive Use and Water Budget component of RGDSS. Irrigated acreage was <br />assigned to a ditch system structure identifier based on service area locations, as <br />described in the 1998 Irrigated Lands Assessment Using Satellite Imagery in the Rio <br />Grande Basin of Colorado, Agro Engineering Inc., July 2000. Parcels without a surface <br />water source were assigned to ground water only aggregates, as described in the Task 8.1 <br />Review Wells and Lands Served by Ground Water Only memorandum, developed by the <br />Surface Water Contractor. Acreage for aggregated diversion structures was determined <br />by adding the acreage of the individual structures making up the aggregate, as described <br />in the Task 7.1 A~~re~ated Water Rights/Irrigated Lands Not Explicitly Modeled <br />memorandum, 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. Table 1 summarizes <br />the 1998 acreage used as a basis for historic consumptive use estimates by source. Table <br />2 summarizes the 1998 acreage by crop type. <br />Table 1 <br />1998 Irri ated Acrea e b Source <br />Acreage Source Acreage % of Total <br />1998 Irri ated Acrea e Assessment 615,092 99 <br />1998 User Defined 7,776 1 <br />Total Basin 622,868 100 <br />C:\Projects\rgdss\finemos_2004\appendA_cropcu_6-2004.doc A-2 of A-10 June 2004 <br />
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