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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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Comments and Concerns <br />The development of return flow patterns for this task 1) utilizes a widely acceptable method, 2) <br />is reproducible, and 3) is based on sites representative of CRDSS basin alluvial aquifers. It is <br />recommended that the patterns previously developed be replaced with the patterns developed in <br />this task. Currently, all irrigation structures in Divisions 4, 5, and 6 and the majority of <br />structures in Division 7 have been assigned return flow pattern "1". As CRDSS basin models are <br />updated, the modeler should consider assigning pattern " 2" to irrigation structures which irrigate <br />lands further from the point of diversion. <br />It is difficult to develop return flow patterns to accurately represent the variations in geology <br />seen in the CRDSS basins, and difficult to define adata-centered methodology for assigning <br />patterns to individual irrigation structures. However, it is believed that the monthly and daily <br />return flow patterns developed and described in this memorandum adequately represent typical <br />geologic conditions and irrigated acreage locations in the CRDSS basins and are appropriate for <br />use in the basin modeling efforts. <br />Page 12 of 12 <br />
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