ISO 1438-1:1980

Water flow measurement in open channels using weirs and Venturi flumes — Part 1: Thin-plate weirs

Specifies methods for the measurement of water flow in open channels using rectangular and triangular-notch (V-notch) thin-plate weirs. The flow conditions considered are limited to steady, free and fully ventilated discharge. Recommended discharge coefficients are applicable to water only in the approximate range of temperatures from 5 to 30 °C.