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<br />This report describes five candidate plans that address four concepts <br />for reducing the river's salt load. These concepts are: a continuation of <br />ongoing programs (no accelerated action alternative), onfarm irrigation <br />water management (non-structural alternative), ditch and pipe lining only, <br />and combining onfarm irrigation water management with onfarm and off-farm <br />ditch and pipe lining (See Table 1-2). <br /> <br />Plan 5, which would provide for the installation of 19,700 acres of <br />sprinkler irrigatioU--systems and 268 miles of irrigation pipeline as well as <br />1850 acres of improved surface systems, is the recommended planj:()r <br />implementation. See Table 1-3 for details of measures planned. The <br />implementation period should be six years and program effectiveness should <br />be evaluated at three-year intervals to determine if the program is <br />achieving the expected degree of salinity reduction. <br /> <br />TABLE 1-3 ESTIMATED QUANTITIES AND COST FOR <br />IMPLEMENTING THE RECOMMENDED PLAN <br />Me ELMO CREEK SALINITY CONTROL STUDY, COLORADO <br /> <br /> 1/ <br />Item Units Quantities Construction Cost <br />Pipeline: <br />Group Di tches mi. 235 6,136,000 <br />On Farm Ditches mt. 33 893,000 <br />Measuring Devices ea. 400 408,000 <br />Sprinkler Systems <br />Gravity Pressure ac. 10,400 8,101,000 <br />Pumped Pressure ac. 9,300 7,784,000 <br />TOTAL COST $ 23,322,000 <br /> <br />1/ July 1981 price base. <br /> <br />Implementation of Plan 5 will reduce salt loading in the Colorado River <br />by 38,000 tons per year. This will result in a 3.9 mg/l reduction in salt <br />concentration at Imperial Dam. The total installation cost is estimated to <br />be $29,752,000. It is recommended that the federal government share the <br />construction cost at a rate not greater than 75 percent. At a 75 percent <br />cost-share, the cost to the federal government is $23.920.000 over the <br />~i_'~::Z,~ar ,imP:1-,e~entat!.o~__l'e,riod! <:".~~~~!ng of ~17 ,490 ,000 for construction, <br />$4,664,000 for administrative and tecnnlcaraBs[stance and S 1,1/0,000 tor <br />education and evaluatfon.--AimuaT"Teve-l'sortUD.<rfrig'needed throughout the <br />implementation period are shown in Table 1-4. The total cost to the local <br />people is estimated to be $5,832,000 for construction and $184,300 per year <br />for operation, ~~~nce and replacement following program implementation. <br /> <br />lJOla~9 <br /> <br />1-4 <br />