. Water Supply and Irrigation Papers of the United States Geological Survey . PRICE PENTA-RECORDING CURRENT METERS. INTRODUCTION. 19 unity in individual cases is, however, greater than in the method and the general results are not as satisfactory. In the other principal single-point method the meter is held nearthe surface, usually 1 foot below, or low enough to be out of the effectof the wind or other disturbing influences. This is known as the sub-surface The coefficient for reducing the velocity taken atthe subsurface to the mean has been found to be in general fromabout
. Water Supply and Irrigation Papers of the United States Geological Survey . PRICE PENTA-RECORDING CURRENT METERS. INTRODUCTION. 19 unity in individual cases is, however, greater than in the method and the general results are not as satisfactory. In the other principal single-point method the meter is held nearthe surface, usually 1 foot below, or low enough to be out of the effectof the wind or other disturbing influences. This is known as the sub-surface The coefficient for reducing the velocity taken atthe subsurface to the mean has been found to be in general fromabout to , depending on the stage, velocity, and channelconditions. The higher the stage the larger the coefficient. Thismethod is especially adapted for flood measurements, or when thevelocity is so great that the meter can not be kept in the correctposition for the other methods. The vertical integration method consists in moving the meter at aslow uniform speed from the surface to the bottom and back againto the surface and noting the number of revolutions and the t
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