Letter From Chief Engineer of the Us Geological Survey Relative to the Irrigat

Cover Letter From Chief Engineer of the Us Geological Survey Relative to the Irrigat
Letter From Chief Engineer of the Us Geological Survey Relative to the Irrigat
Geological Survey Us
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These figures are given for pur- poses of comparison only. As the result of a number of experiments, it has been found that the principal quantity of silt is carried along near the bottom of the river, and that the surface water is relatively free from sediment. It is planned, therefore, to take the water into the canals by a skimming process over a long row of flashboards, so that the entire capacity of the canal can be furnished by drawing but one foot in depth of water from the surface of th...e river. As a still further precaution, it is proposed to construct the first 3, 000 feet of canal on each side of the river of such size that the movement of water through it will be slower than one foot per second. Thesesettling basins, as the3 r are called, would be either excavated from granite, or where the sec- tion is in earth they would be paved. At the lower end of these settling basins, gates will be arranged to discharge into the river, so that the water can be drawn down to the level of the stream, and a grade of 11 feet in 3, 000 feet thus obtained.

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