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Significance and Use
5.1 Broad-crested weirs can be used for accurate measurements of a wide range of flow rates, but their structural simplicity and sturdiness make them particularly useful for measuring large flows under field conditions.
5.2 Because they require vertical sidewalls, broad-crested weirs are particularly adaptable to rectangular artificial channels or to natural and artificial channels that can readily be lined with vertical sidewalls in the immediate vicinity of the weir.
1.1 This test method covers measurement of the volumetric flow rate of water in open channels with two types of horizontal broad-crested weirs: those having a square (sharp) upstream corner and those having a well-rounded upstream corner.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1129 Terminology Relating to Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3858 Test Method for Open-Channel Flow Measurement of Water by Velocity-Area Method
ISO StandardsISO3846-1989 Liquid Flow Measurement in Open Channels by Weirs and Flumes--Rectangular Broad-Crested Weirs ISO4373-1979 Measurement of Liquid Flow in Open Channels--Water Level Measuring Devices ISO4374-1990 Liquid Flow Measurement in Open Channels by Weirs and Flumes--Round-Nose Horizontal Crest Weirs ISO555-1973 Liquid Flow Measurement in Open Channels--Dilution Methods for Measurement of Steady Flow--Constant Rate Injection Method
ICS Number Code 17.120.20 (Flow in open channels)