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WSP00392
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Last modified
1/26/2010 12:25:47 PM
Creation date
10/11/2006 9:42:43 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8276.150
Description
Grand Valley Unit-Colorado River Basin Salinity Control Project
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
4/1/1992
Title
1991 Annual Report: Grand Valley Salinity Control Project Monitoring and Evaluation Program
Water Supply Pro - Doc Type
Annual Report
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<br />co <br />C) <br />C~) <br />o <br /> <br />(..) <br /> <br />,~) significantly higher measurements this year than in previous years. <br />Salinity levels were higher at the upper end of the field on 2 <br />sites, higher at the bottom of the field on 3 sites, and higher at <br />both the upper end and the lower end of the field on 3 sites. <br /> <br />sites 43 and 45 have only been monitored for two years, therefore <br />it is difficult to make any comparisons. The application of high <br />amounts of manure in the fall could have caused salinity levels to <br />rise at site 32 in the upper 18 inches. At sites 11, 13, 15, 16, <br />and 21, the crop is the same this year as last year. Irrigation and <br />management was about the same this year compared to previous years. <br /> <br />Two sites, 11 and 17, have been monitored for eight years. <br />Salinity levels have changed very little during this period of <br />time. The irrigation method (furrow, sprinkler, or drip) has had <br />little effect on salinity trends. <br /> <br />Since soil salinity is a dynamic soil property, the sites need to <br />be monitored several years to determine long term trends which <br />would be more meaningful than year to year comparisons. There does <br />not appear to be any trend for increase or decrease in soil <br />salinity at this time. <br /> <br />f. Irrigation Adequacies At Sites: Overuse of water is prevalent <br />throughout the Grand Valley because of abundant supply of <br />inexpensive irrigation water. Very few farmers practice good <br />irrigation water management. A few farmers are concerned about <br />paying overage cost for excess irrigation water. <br /> <br />Most operators under the M&E program, received individual <br />irrigation summaries at least once during the irrigation season <br />and then at the end of the year. Data from their sites were <br />explained to them and recommendations provided to improve <br />irrigation efficiencies, e.g., better irrigation scheduling, <br />adjusting set times or inflow rates, reducing or increasing time of <br />set, and furrow flow or number of furrows. Before the start of the <br />new irrigation season, some operators received soil moisture <br />deficit data to help them with their irrigation management <br />decisions. Very few operators made any changes to their existing <br />irrigation practices. <br /> <br />Most sites were more than adequately irrigated. According to M&E <br />data, site number 18, 26 and 51 appear to be under-irrigated. <br />However, field moisture testing indicated adequate moisture during <br />the time M&E data indicated the field to be deficit. All these <br />sites have high water tables and the operators know the fields do <br />not need to be irrigated as much. <br /> <br />24 <br />
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