Measurement of liquid flow in open channels by weirs and flumes -- End depth method for estimation of flow in non-rectangular channels with a free overfall (approximate method)
This standard has been revised by ISO 18481:2017
Specifies a method for the estimation of subcritical flow of clear water in smooth, essentially horizontal, straight open channels with a vertical drop and discharging freely. Gentle positive slopes not greater than 1 in 2000 are admissible. Covers channels with the following types of cross-section, the nappe being confined: a) trapezoidal; b) triangular; c) parabolic; d) circular.
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