. Water Supply and Irrigation Papers of the United States Geological Survey . lled measuring points, are measured off above and in theplane of the measuring section at which observations of depth andvelocity are taken. (See PL I, B.) These points are spaced equallyfor those parts of the section where the flow is uniform and smoothand are spaced unequally for other parts according to the discretionand judgment of the engineer. In general the points should notbe spaced farther apart than 5 per cent of the distance betweenpiers, nor farther apart than the approximate mean depth of thesection at t
. Water Supply and Irrigation Papers of the United States Geological Survey . lled measuring points, are measured off above and in theplane of the measuring section at which observations of depth andvelocity are taken. (See PL I, B.) These points are spaced equallyfor those parts of the section where the flow is uniform and smoothand are spaced unequally for other parts according to the discretionand judgment of the engineer. In general the points should notbe spaced farther apart than 5 per cent of the distance betweenpiers, nor farther apart than the approximate mean depth of thesection at the time of measurement. The measuring points divide the total cross section into elementarystrips, at each end of which observations of depth and velocityare made. The discharge of any elementary strip is the productof the average of the depths at the two ends times the width of thestrip times the average of the mean velocities at the two ends of thestrip. The sum of the discharges of the elementary strips is the total U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 245 PLATE I. A. CURRENT-METER RATING STATION AT LOS ANGELES, CAL.
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