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ISO 1438
M00000504
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ISO 1438 3rd Edition, April 1, 2017 Hydrometry - Open channel flow measurement using thin-plate weirs
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Description / Abstract: This document defines the requirements for the use of rectangular and triangular (V-notch) thin-plate weirs for the measurement of flow of clear water in open channels under free flow conditions. It includes the requirements for the use of full-width rectangular thin-plate weirs in submerged (drowned) flow conditions.