Liquid flow measurement in open channels by weirs and flumes -- End-depth method for estimation of flow in rectangular channels with a free overfall
This standard has been revised by ISO 18481:2017
Specifies a method for the estimation of sub-critical flow of clear water in smooth, straight, rectangular prismatic open channels with a vertical drop and discharging freely. Using the measured depth at the end, the flow in rectangular channels (horizontal or sloping) with confined nappe and unconfined nappe may be estimated.
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