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<br />;t <br /> <br />CHAPTER 4 <br /> <br />SELECTED PLAN <br /> <br />Plan Installation <br /> <br />Plan Description <br /> <br />:""-1 <br /> <br />The Selected Plan describes and evaluates a voluntary installation of <br />modernized irrigation systems on 15,700 acres. This will be an <br />85 percent participation rate in the program. It is estimated that the <br />predominant type of installation will be low-pressure sprinkler <br />irrigation systems, but may also include installation of automated <br />border irrigation systems. For cost estimating purposes, sprinkler <br />irrigation systems were used, as the analysis indicates no significant <br />difference in installation costs between low-pressure sprinkler and <br />automated-border systems. The Selected Plan also provides for the <br />voluntary replacement of fish and wildlife values which will be impacted <br />due to the installation of the improved irrigation systems. <br /> <br />r--,' <br /> <br />~. <br /> <br />The cost-shared salinity control, soil conservation, and fish and <br />wildlife practices to be utilized in the implemen;:ation of the salinity <br />control project are found in Table 4-1. This table also includes a <br />listing of conservation practices the irrigators may have to install <br />without cost-share assistance to achieve project objectives. <br /> <br />t". <br /> <br />While it was recognized during plan formulation that there may be <br />smaller areas within the project that contribute somewhat greater salt <br />loadings, no attempt was made to prioritize the project into smaller <br />treatment units. This decision is based on the fact that the project is <br />compact, well defined, and the Big Sandy River is the single outlet for <br />water leaving the project area. There are approximately 80 irrigators <br />in the project area. This decision also recognizes that if maximum <br />salinity control benefits are to be realized, implementation needs to <br />occur throughout the project area. <br /> <br />F' <br />;, <br />tf <br /> <br />In determination of project costs, the following assumptions were made: <br /> <br />"h <br /> <br />1 - The power source for onfarm pumping will be entirely electric. <br />This requires installation of a 3-phase power line into the <br />valley and to individual farm units. The power line <br />installation will be a local cost. <br /> <br />,..,. <br /> <br />, <br />" <br />,.', <br /> <br />2 - Side-roll type low-pressure sprinkler systems and semiautomated <br />and automated-border irrigation systems will be installed on <br />15,700 acres of the 18,370 acres of water-righted acres in the <br />project; and, on larger fields, low-pressure center-pivot <br />systems will likely be installed, which will generally be more <br />economical. <br /> <br />'i~~-: <br /> <br />'-"":" <br />~, . <br /> <br />()':) 11 tl J <br /> <br />4-1 <br />