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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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Daily Analysis -Lands Close to Live Stream <br />The State's Glover model was run with the parameters selected above using a "stress" of one day <br />of recharge. The results of this analyses are shown in Figure 5 for lands irrigated close to a live <br />stream. Although the pattern extends for 245 days, only the first 90 days are shown here so the <br />graph is easier to read. As with the monthly returns, surface water returns were estimated to be <br />50 percent of total returns. For the daily pattern, surface water is estimated to return to the river <br />the day after application. Figure 5 also shows the total return flow percents. These values were <br />formatted and included in the CRDSS daily delay pattern file (*.dld) as pattern "1". This file is <br />included as Exhibit B. <br />Figure 5 <br />Daily Ground Water and Total Returns as Percent of Recharge <br />Lands Closer to Live Stream <br />o.~ <br />0.6 <br />0.5 <br />c <br />s`. 0.4 <br />C. <br />c <br />~ 0.3 <br />0.2 <br />0.1 <br />31 61 <br />Days (pay 1=Day of Recharge) <br />Ground Water Returns -Total Returns <br />The Daily Yampa Memo describes a procedure used to compare a return flow pattern based on <br />one month of recharge to a return flow pattern based on one day of recharge. As described, a <br />table was developed to compare daily and monthly return flow patterns by applying the daily <br />pattern to a unit recharge for thirty days. This procedure was followed to compare the monthly <br />and daily return flow delay patterns developed in this task for lands close to a live stream. Table <br />5 presents the results of the comparison. As noted in the Daily Yampa Memo, the State's model <br />develops monthly patterns based on 365 days/12 months, therefore the sum of daily returns <br />shown in Table 5 is based on 30.4 days in each month. <br />Page9of12 <br />
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