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<br />TABLE 11. ENVIRONMENTAL QUALITY ACCOUNT, ALTERNATIVE 2, <br />VIRGIN VALLEY SUBEVALUATION UNIT, ARIZONA, NEVADA, UTAH <br /> <br />Components <br /> <br />Measure of Effects <br /> <br />Beneficial and adverse effects: <br /> <br />A. Areas of natural beauty <br /> <br />1. More efficient use of exist- <br />ing water supply for irriga- <br />tion, providing a green color <br />contrast over a longer period <br />of time in an arid area, <br /> <br />(~ <br /> <br />2. Eliminate some onfarm earthen <br />ditches and associated vege- <br />tation. <br /> <br />3. Increase average streamflow <br />by 12.6 cubic-feet-per-second <br />in this 25 mile reach of Virgin <br />River from increased irrigation <br />efficiency. Net annual increase <br />in water 9,100 acre-feet surface <br />flow, <br /> <br />:;. <br /> <br />4. Reduce loss of natural soil re- <br />source from waterlogging with <br />accompaning salt buildup, <br /> <br />B. Quality considerations of <br />water, land, and air <br />resources <br /> <br />1, Decrease 14,000+ acre-feet of <br />irrigation water percolating to <br />and being contaminated by saline <br />aquifers. <br /> <br />2, Annual reduction of 37,200 tons <br />of salt in the river system, <br /> <br />3, Less diversions during spring <br />allowing higher flows to move <br />down river. <br /> <br />~ <br /> <br />4. Dust, smoke, and noise will be <br />created during construction, <br />However, fugitive dust shall be <br />controlled by watering or other <br />means during the construction and <br />repair of irrigation canals, <br />Most construction will occur in <br />the winter months (October through <br />February). Construction time re- <br />quired will total approximat~ly <br />50 months. <br /> <br />.' <br /> <br />48 <br /> <br />OiJC~ 8 <br />