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<br /> <br />002557 <br /> <br />. <br /> <br />. <br /> <br /> <br />Streams and run-off.- Water conditions improved markedly throughout <br />most of the region during the winter and spring of 1962. Seasonal <br />total precipitation at many points was well above average as was the <br />snowpack in the mountainous areas. While storage in many reservoirs <br />remained below average, gains in water accumulated during the spring <br />were well above normal. Stream flow in the region was generally near <br />or above normal. The over-all favorable outlook as exemplified by <br />flow of the Colorado River near Grand Canyon at 162 percent of median <br />on June 1, which was excessive for the second consecutive month. <br /> <br />New projects were started as follows: (1) In Arizona, a series of <br />discharge measurements and related observations were made in canals in <br />the Gila Project, to demonstrate the use of radioactive isotopes in <br />stream gaging. (2) In California, the snowmelt hydrology of the North <br />Yuba River was investigated by attempting to synthesize the daily <br />hydrograph during the 3-month snowmelt periods of wet and dry years, <br />using physical laws of heat exchange. Work was begun on a flood- <br />inundation map of San Diego County. <br /> <br />Reports released for public inspection included surface-water hydrology <br />of coastal basins of northern California, floods of February 1962 in <br />southern Idaho and northeastern Nevada and a summary of surface water <br />run-off, storage and diversions was prepared for Arizona. <br /> <br />Changes in the stream-gaging network during the six months were as <br />follows: <br /> <br /> Stations established Stations <br />State or reinstated discontinued <br />Arizona 10 0 <br />California 27 8 <br />Nevada 2 0 <br /> <br />Ground-water hydrology.- New projects were started (1) in California, <br />to determine in the Lower Santa Ynez Valley, Santa Barbara County, the <br />cause of quality changes of ground water in the Lompoc Plain including <br />the affected aquifers, areal extent, magnitude and rate of change. <br />Evaluation of the ground water resources and related geologic considera- <br />tions in Joshua Tree National Monument. (2) In Wyoming, investigation <br />of the hydrology as related to the mining of trona deposits near Green <br />River. <br /> <br />Projects that were completed included (1) in California, pumpage-power <br />correlation in the Santa Ynez Valley,ground -water appraisal in Terra <br />Bella-Lost Hells area and geologic phase of the appraisal of ground- <br />water conditions in the Kern River alluvial fan and (2) in Nevada, <br />ground-water resources of Pine Forest Valley, Humboldt County; Imlay <br />area, Humboldt River Basin; Diamond Valley, Eureka and Elko Counties; <br />Desert Valley, Humboldt and Pershing Counties; Independence Valley, <br /> <br />-2- <br />