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ISO 9827:1994 Measurement of liquid flow in open channels by weirs and flumes - Streamlined triangular profile weirs
standard by International Organization for Standardization, 06/01/1994
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Specifies methods for the measurement of the flow of water in open channels under steady flow conditions. The flow conditions considered are free flow, which is dependent on the upstream head only, and drowned flow, which depends on both upstream and downstream water levels.