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<br />N <br />W <br />00 <br /><=> <br /> <br />of 1972. Of the total increase, 6.0 million acre-feet occurred <br />in the Upper Basin and 2.8 million acre-feet in the Lower Basin. <br />The 1977 water year storage in the Colorado River System is <br />about 5.7 maf less than the 1976 value. <br /> <br />Historical Uses <br /> <br />Estimated historical upper and Lower Basin uses for the <br />calendar years 1973 through 1976 are shown on Table 3. <br /> <br />Salinity at Monitoring Stations <br /> <br />Salinities at monitoring stations below Hoover Dam for <br />the years 1973, 1974, 1975, and 1976 are shown on Table 4. <br />These values are all less than the 1972 numeric criteria. <br />These decreases in salinities are considered to be primarily <br />due to the water supply conditions and the increase in reser- <br />voir storage that have occurred since 1972. Because of the <br />time lag in the river system, _the impact of the high flows <br />of 1973 and 1975 are still being reflected at the three stations <br />in the lower mains tern where standards have been established. <br /> <br />Salinity Control Actions <br /> <br />The Bureau of Reclamation-is continuing its preparation <br />of Definite Plan Reports (DPR) on three of the four projects <br />authori~ed in P.L. 93-320: Grand Valley Unit, Paradox Valley <br />Unit, and Las Vegas Wash Unit. Due to the high estimated <br />coetpeX' ton of salt: removed, -. the construction of Crystal <br />Geyser has been deferred. The DPR for the Paradox Valley is <br />to be completed by January 1978. A total of 18 test wells <br />have been drilled and pumping tests conducted. These wells, <br />if suitable, will be incorporated into the permanent well <br />field as necessary. The Las Vegas Unit DPRhas been completed <br />and it is anticipated that it will be released by January 1978. <br /> <br />5 <br /> <br />k:i. <br /> <br />! <br />'.; _ .k :1<ij <br />