Congressional Edition Volume 6245

Congressional Edition Volume 6245

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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. 1912 edition. Excerpt: ...the snow fields of the high mountain areas would thus amount to 7.7 inches a season. This figure, though not accepted as correct, is yet very useful in connection with studies of stream-flow data. EVAPORATION FROM WATER SURFACE. In the course of these investigations measurement of evaporation from free water surface has been made under three conditions--from a pan floating in a body of water, from a pan placed in the soil, and from a deep tank placed in the soil. The first two were designed to furnish data regarding evaporation from reservoir surfaces and from areas of shallow flood water, respectively. The third was desired for purposes of comparison with records of evaporation from soil. The pans, which were of the pattern used by the Reclamation Service, were 3 feet square and 10 inches deep and were made of sheet galvanized iron. Observations were made by replacing the amount evaporated with a cup whose capacity was equal to a depth of 0.01 inch in the pan. The initial height of the water surface was such that a pin projecting from the center of the pan and remaining at a fixed height, 2 inches below the rim, was just submerged. The deep tank was circular, 3J feet in diameter and 4 feet deep, and observations were made in a stilling well with a hook gage and vernier scale reading to 0.01 inch. The records were all kept near Independence, and observations were made every second day in summer and every fourth day in winter. The record for the pan in water is available from August 4, 1908, to June 1, 1911, with four intervals of a few days each when the pan floated away. The pan was at first located in Blackrock Slough, but was moved to its final location in Owens River at Citrus bridge May 7, 1909. (See Pl. XI, A.) Another pan that had been...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236518403
  • 9781236518408