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<br />systems is estimated to total $733,000. Presently, about $10,000 is <br />spent annually for operation and maintenance of the delivery systems <br />which have a combined length of about 14 miles. Operation, maintenance <br />and replacement costs of the recommended off-farm distribution system <br />improvements would increase to $23,400 annually. <br /> <br />Installation cost for Alternative 2 including $430,000 for technical <br />assistance totals $3,100,000. Total program cost including operation, <br />maintenance and replacement costs and fol1owup technical assistance added <br />is estimated to be $479,800 annually over a 25-year evaluation period. <br /> <br />Downstream and onfarm annual benefits increase during installation <br />and total $2,172,200 following installation. Total program benefits are <br />$3,234,200 annually and net benefits of the salinity control program are <br />over 2.7 million dollars. Downstream annual benefits are $2,052,400 <br />based on a reduction of about four mi1ligrams-per-liter in salt concen- <br />tration in the Colorado River at Imperial Dam near Yuma, Arizona. Annual <br />onfarm benefits accruing from Alternative 2 are $119,800. This includes <br />labor savings of $50,000. <br /> <br />Implementation of Alternative 2 could require at least a 75 percent <br />federal cost-share assistance to assure adequate farmer participation. <br />Land users would furnish the remaining cost plus annual operation, main- <br />tenance, and replacement costs. See Table 1. Existing local indebted- <br />ness may require a higher level of cost-share assistance for the canal <br />system improvements in Virgin Valley. Proper water management as well <br />as improved systems are necessary to achieve the salinity control objec- <br />tives. <br /> <br />TABLE 1. ANNUAL LEVEL OF FUNDING FOR lD-YEAR INSTALLATION PERIOD, <br />ALTERNATIVE 2, VIRGIN VALLEY SUBEVALUATION UNIT, ARIZONA, NEVADA <br /> <br />ANNUAL FEDERAL FUNDING ANNUAL OTHER FUNDING ANNUAL <br />--~--_._- ----- .....~..----------------.. ---..- <br />Constiuc- Technical Construc- <br />tion lJ Assistance Total tion OK&R Total Total <br />$200,300 $43,000 $243,300 $66,700 $7,500 $74,200 $317,500 <br /> <br />11 1980 Prices - Based on '75 percent federal cost-sharing assistance. No <br />Utah irrigated lands in this subevaluation unit. <br /> <br />iv <br /> <br />000252 <br />