. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. AJbrfe „-' p* FIGURE Pit River 1,500 below Pit 4 Dam. Release of water at dam 75 Photograph by W. O. Cheney, August, 1955. The new Pit 4 Powerhouse is at elevation 2,080 feet, the diversion dam at 2,400; distance between them along the channel is about 1\ miles; gradient 8 feet per thousand. Most of the water is diverted out of the river into a 4-mile tunnel leading to the powerhouse. The study described here was undertaken
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. AJbrfe „-' p* FIGURE Pit River 1,500 below Pit 4 Dam. Release of water at dam 75 Photograph by W. O. Cheney, August, 1955. The new Pit 4 Powerhouse is at elevation 2,080 feet, the diversion dam at 2,400; distance between them along the channel is about 1\ miles; gradient 8 feet per thousand. Most of the water is diverted out of the river into a 4-mile tunnel leading to the powerhouse. The study described here was undertaken to provide data which might be helpful in solving the problem of how much water should be released into the natural channel between dam and powerhouse for maintenance of fish life. It was considered probable by those concerned thai the required amount of water would not be over 250 Therefore this figure was set as the upper limit for the study, and surveys were made at releases of 50, 100, 150, 200, and 250 Volume was measured by a recording gauge below the dam, and water release was kept constant by auto- matically operated gates in the dam. The entire river bed from dam to powerhouse was surveyed by a transit traverse, and stations were laid out at 1,000-foot intervals as measured along the center line of the channel. At each station the cross section of the river bottom was care- fully profiled with surveyor's level, and the elevation of the water sur- face in relation thereto measured for each rate of How. The 40 cross sections thus obtained were plotted to a large scale on paper. The maxi- mum depth, the wetted perimeter (the distance measured along the bottom, including the irregularities, from the water surface on one side to the water surface on the other), and the area of the cross section were scaled from the drawing nor each volume of release. The average water velocity through each cross section was calculated from the area so measured and the know
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Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
