Geological Survey Water-Supply Paper Volume 2021-2026

Geological Survey Water-Supply Paper Volume 2021-2026

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ...had much smaller net changes. The results of the mass sampling show that irrigation is affecting the selenium content of some waters in the area, but it is difficult to sort out definite effects of irrigation on'the occurrence and movement of selenium in the area, for the selenium concentration in water at locations in category A increased at 29 percent of the locations, decreased at 34 percent of the locations, and had little or no change at 37 percent of the locations. The changes of selenium concentrations caused by irrigation are probably local and thus differ from location to location. A single general statement cannot be made that would be applicable to the entire irrigated area concerning the effects of irrigation on the selenium concentration in waters of the area. Irrigation undoubtedly has accelerated the movement of selenium within and from the irrigated area. SUMMARY AND CONCLUSIONS Selenium in concentrations exceeding the maximum limit recommended by the U.S. Public Health Service is present in some waters in areas near Casper, Wyo. Surface water brought into the area for irrigation does not contain significant amounts of selenium, but the water is applied to some land containing soluble selenium. The result is that some of the selenium is taken into solution and carried to the ground-water system, thence into the streams. No geologic formation or area consistently contains high concentrations of selenium, but high concentrations were found at points throughout the area. Probably, the rocks in any locality could be the source of selenium in the water in the surrounding vicinity. The quality and quantity of ground water within the Kendrick Project are influenced by irrigation water. In some areas irrigation causes increased more

Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 1236774000
  • 9781236774002