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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />A description of each project is presented along with an analysis of its technical feasibility and an <br />estimate of the amount of water that could potentially be conserved by the implementation of <br />each project. A brief environmental assessment of each project is also presented in Chapter VI. <br />It is important to understand that these projects are not mutually exclusive; the <br />implementation of one may ultimately affect the results of others. As an example: to fully <br />realize the conservation benefits associated with alternative irrigation scheduling, the <br />construction of regulating reservoirs or interceptors may be necessary due to resulting increased <br />returns flows. Without the addition of interceptors or regulating reservoirs the increased return <br />flows would ultimately end up as operational discharge in the drains. <br /> <br />IV.A.] Automated Check Gates <br /> <br />The Conservation Verification Committee (CVC) has estimated, based on limited studies, that <br />the use of automated check gates if used properly might reduce the average tail water generated <br />by 15 percent. The degree of automation and control of an irrigation delivery system has a direct <br />effect on the flexibility and rate of water deliveries to water users. lID water users have <br />repeatedly stated that they believe they can reduce tailwater if they get a constant, non- <br />fluctuating, accurate delivery. Automated check gates may be one way to provide improved <br />delivery to water users. Over the past five years, in an effort to minimize unsteadiness in the <br />delivery system, the District has installed and tested three different types of automated check <br />structures. To date, no conclusions have been made on whether or not the automated check <br />structures conserve water. In order to determine the conservation potential of automatic check <br />structures, a longer testing period than the two years utilized in the Plum-Oasis Study is needed. <br />Additional on-farm studies to quantify the water conservation potential of more steady deliveries <br />are also needed. <br /> <br />IV.A.2 Additional Lateral Concrete Lining <br />Benefits derived from the installation of concrete lining are: <br /> <br />1. Seepage losses reduced by as much as 90 percent. <br />2. Maintenance costs reduced, including removal of aquatic weeds. <br />3. Conveyance efficiency increased. <br /> <br />Draft: Subject To Revision 12/21/95 <br /> <br />30 <br />