Geological Survey Professional Paper Volume N . 927

Geological Survey Professional Paper Volume N . 927

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ...July 1971. The variability in the mean daily hydrograph levels, which had diminished during the summer drawdown, returned in late September. In October 1971 the hydrographs of Devils Hole and well 17S/50-36dd resumed slow and parallel declines. It became evident that the cessation of pumping for wells 4, 5, and 6 had produced only about 0.2 ft (6 cm) of recovery in Devils Hole and that continued pumping of wells 1, 2, or 3 was lowering the water level. The recorder in Devils Hole malfunctioned in midDecember 1971, but the recorder in well 17S/50-36dd continued to operate. On December 20, wells 2 and 3 were shut down, and a slow recovery of the water level began in the observation well. In January 1972, well 1 stopped pumping, and the recovery in well 17S/50-36dd increased in rate. Analysis of the data collected through January 1972 showed that wells 7, 8, and 13 had no detectable effect on the water level in Devils Hole; wells 1, 4, and 5 had significant effects; and either well 2 or well 3, or both, had a measurable effect. No direct hydraulic data pertinent to the effect of well 6 had been obtained before it was abandoned. However, reduction of the discharge records of Crystal Pool during the late summer of 1971 show that about 90 percent of the well 6 discharge was compensated by reduction of the flow of Crystal Pool. Because observation well 17S/50-36dd did not respond as clearly to pumping in the Point of Rocks area as it did to use of wells 4 and 5, an alternative Figure 14.--Segments of the 1972 hydrograph of observation well 17S/51-31dd, showing effects of wells 1, 2, 3, and 17. Dashed segments in upper hydrograph denote extrapolation through periods of no data. path of influence was sought. Well 17S/51-31dd (fig. 7) was equipped with a water-level...show more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236612973
  • 9781236612977