Water-supply and Irrigation Papers of the United States Geological Survey, Ausgaben 129-133

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U.S. Government Printing Office, 1905
 

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Seite 129 - The serial publications of the United States Geological Survey consist of ( 1 ) Annual Reports, (2) Monographs, (3) Professional Papers, (4) Bulletins, (5) Mineral Resources, (6) Water-Supply and Irrigation Papers, (7) Topographic Atlas of United States — folios and separate sheets thereof, (8) Geologic Atlas of the United States — folios thereof.
Seite 11 - The vertical integration method consists in moving the meter at a slow, uniform speed from the surface to the bottom and back again to the, surface and noting the number of revolutions and the time taken in the operation. This method has the advantage that the velocity at each point of the vertical is measured twice. It is useful as a check on the point methods.
Seite 13 - ... for the day when the mean gage height was highest. As the gage height is the mean for the day, it does not indicate correctly the stage when the water surface was at crest height, and the corresponding discharge was consequently larger than given in the maximum column. Likewise, in the column of "Minimum" the quantity given is the mean flow for the day when the mean gage height was lowest. The column headed "Mean" is the average flow in cubic feet for each second during the month.
Seite 11 - The single-point method consists in holding the meter either at the depth of the thread of mean velocity or at an arbitrary depth for which the coefficient for reducing to mean velocity has been determined or must be assumed. Extensive experiments by means of vertical velocity curves show that the thread of mean velocity generally occurs between 0.5 and 0.7 total depth.
Seite 13 - ... depth will give (closely) the mean velocity in the vertical. Actual observations under a wide range of conditions show that this...
Seite 16 - The table of daily gage heights gives the daily fluctuations of the surface of the river as found from the mean of the gage readings taken each day.
Seite 122 - The channel is straight for 600 feet above and 300 feet below the station. The current is swift. Both banks are of medium height and are not liable to overflow. The bed of the stream is composed of rocks and gravel. There are three channels at low water and five channels at high water.
Seite 7 - In the second multiple-point method the meter is held successively at 0.2 and 0.8 depth, and the mean of the velocities at these two points is taken as the mean velocity for that vertical.
Seite 20 - DESCRIPTION. St. Mary River heads in northern Montana, near the Canadian boundary line, on the eastern slope of the main range of the Rocky Mountains, in a region of perpetual snow and in the midst of innumerable glaciers.

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