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<br />TABLE 4. <br /> <br />WATER AND SALT BUDGETS, PRESENT CONDITIONS, <br />VIRGIN VALLEY SUBEVALUATION UNIT, ARIZONA, NEVADA, <br />Water <br />Acre-feet/year <br /> <br />UTAH <br /> <br />Salt <br />Tons/year <br /> <br />1/ <br />Littlefield, Arizona Gage- 220,800 <br />Local Inflow (runoff and groundwater recharge) 12,300 <br /> <br />384,900 <br /> <br />3,300 <br /> <br />Total 233,100 <br /> <br />388,200 <br /> <br />Depletions <br /> <br />Crop Consumptive Irrigation Use <br /> <br />-14,100 <br />-12,600 <br />192,400 349,900 <br />14,0001/ 76,10~/ <br />206,400 426,000 <br />-10,400 <br />196,000 426,OOrP <br /> <br />Phreatophyte Use, Evaporation, <br />Livestock and Domestic Use, etc. <br /> <br />. 2/ <br />Surface Flow at Riverside, Nevada Gage- <br /> <br />Subsurface Flow at Riverside, Nevada <br /> <br />Outflow From Program Area <br /> <br />Phreatophyte Use <br /> <br />Total Outflow to Lake Mead <br /> <br />1/ Abow Littlefield, Arizona, 319 &cr.. 1D the proll'_ are. ar. irrilated by aurfae. methodl. <br />S.le budget. for alternative pl~ ar. Biven in Table 9. <br />1/ Concurrent y..ra of flow and salt recorda ae 'Littlefield, Arizona. and Rin:rI1de, N.....d., <br />a.. va.a. y.a.a 1972-1974, 1978 aad 1979. <br />11 B...d OD computation. for flow anA salinity ....uremeat at the locatioD coaaidered by USSR <br />for constructioa of . grouad waCer barrier. DtlCualioal in 1980 and 1981 with Robert Barton, <br />USBR. Boulder City, Nevada, 1Ildicated value. are vitb1D . re.soo.able range. <br />.il Eat1u.ced salt pick up 18 31,800 tonl ErOll irrigation and other US.., plua 3,300 tona frO'll <br />local 1nflow. <br /> <br />Salt Budget - Daily salt loads were calculated for the gage at Little- <br />field for water years 1972-74, and 1978-79 using the mean daily flow and <br />daily specific conductance readings published in the USGS Water Resources <br />Data reports for Nevada. Daily flow and water quality data for the gage <br />at Riverside are only available for water year 1979. These data were <br />plotted and relationships developed between them. Daily salt loads for <br />water years 1972-74 and 1978 were calculated for daily flow measurements. <br />The calculations show that an average of 384,900 tons of salt flow past the <br />Littlefield gage while approximately 349,900 tons are carried in surface <br />flow past the Riverside gage each year, An additional 76,100 tons of salt <br />are carried by ground water at Riverside based on an average subsurface <br />flow of 14,000 acre-feet with an average salinity concentration of 4,000 <br />mg/l. The salt budget for the present condition is given in Table 4. <br />Figure S and S":A illus.trate the water and salt budgets. <br /> <br />11 <br /> <br />r, ') c, r, l)" 8' <br />}.' , . <br />,'... u '- <br />