CAN/CGSB-157.2-M91

This National Standard of Canada is equivalent to International Standard ISO 748:1979. This International Standard specifies methods for determining the velocity and cross-sectional area of water flowing in open channels (with or without ice cover), and or computing the discharge therefrom. It covers methods of employing current-meters and floats to measure the velocities. Although, in most cases, these measurements are intended to determine the stage-discharge relation by means of readings at several stages, this International Standard deals only with single measurements of the discharge; the continuous recording of discharges over a period of time is covered in ISO 1100. NOTE - Measurements for the purpose of determining the discharge in efficiency tests of hydraulic turbines are specified in IEC Publication 41, International code for the field acceptance tests of hydraulic turbines.