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CRDSS_Task1_15-17_ColoRiver_IrrigationReturnPatterns
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CRDSS_Task1_15-17_ColoRiver_IrrigationReturnPatterns
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Last modified
11/22/2019 7:25:53 AM
Creation date
7/10/2008 1:58:04 PM
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Decision Support Systems
Title
CRDSS Task 1.15-17 Colorado River Basin Representative Irrigation Return Flow Patterns
Description
The purpose of this task was to develop return flow patterns for both the monthly and daily CRDSS planning models using geologic parameters representative of actual locations of irrigated acreage in each of the five CRDSS basins and a methodology that is acceptable and can be reproduced.
Decision Support - Doc Type
Task Memorandum
Date
1/20/2003
DSS Category
Surface Water
DSS
Colorado River
Basin
Colorado Mainstem
Contract/PO #
C153933, C154062
Grant Type
Non-Reimbursable
Bill Number
SB92-87, HB93-1273, SB94-029, HB95-1155, SB96-153, HB97-008
Prepared By
Leonard Rice Engineering
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Results <br />Ten (10) sites were chosen representing irrigated acreage in the CRDSS basins. The sites were <br />chosen in part because of readily available geologic data in the LRE library. Figure 1 shows the <br />CRDSS basins and the location of the sites used to estimate representative Glover parameters. <br />Exhibit A provides a description and enlarged view of each irrigated acreage site used in the <br />analyses. In general, the alluvial aquifers underlying irrigated acreage in the CRDSS basins are <br />composed of gravel and sand/gravel mix. Table 1 provides the geologic parameters for each site, <br />plus provides the water district identifier (WDID) of the structure providing irrigation water to <br />each site. Both the average and median values are provided. The average value was used to <br />represent each parameter with the exception of the distance from the stream to the impervious <br />boundary. Because Site 1 skews the average value of the distance from the stream to the <br />impervious boundary, the median value was believed to be more representative for the basin- <br />wide analyses. <br />The values chosen for the distance from the live stream to the location of recharge were 600 feet <br />for lands relatively close to the stream and 1,500 feet for lands further from the stream. These <br />values are reasonable because the location of irrigated acreage throughout the CRDSS basins is <br />generally near the point of diversion <br />Page3of12 <br />
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