NEMI Method Summary

Method Summary Information

Method Number: D5614 Media: WATER
Revision: Reapproved 1998. Current edition approved Sept. 15, 1994. Published November 1994.
Method Source: ASTM International
Subcategory: PHYSICAL Analytes in this method
Official Name: Standard Test Method for Open Channel Flow Measurement of Water with Broad-Crested Weirs
Descriptive Name Open Channel Flow Measurement of Water
Source Info: ASTM International
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Conshohocken, PA 19428
Telephone: (610) 832-9500
Fax: (610) 832-9555
Email: service@astm.org
Citation: ASTM Volume 11.01
 
Brief Method
Summary:
 In broad-crested weirs, the length of the horizontal crest in the direction of flow is large enough relative to the upstream head for essentially rectilinear critical flow to occur at some point along the crest. This ideally permits the flow rate to be obtained from a single measurement of the upstream head; a corrective coefficient must be applied in practice. This coefficient has been evaluated experimentally for square-edge weirs and can be determined analytically for rounded weirs.
Scope And
Application:
 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.
Applicable
Conc Range:
 None.
Interferences: Broad-crested weirs are not suitable for use in sediment-laden streams that are carrying heavy bed loads. However, floating debris is readily passed, particularly by the rounded weir.
Broad-crested weirs cannot be used beyond submergence limits because insufficient data exist to document their performance. It is therefore necessary to adhere to the tailwater-level limitations described in this test method.
QC Requirements:
Sample Handling:
Max Holding Time:
 
Relative Cost: Greater than $400
URL to obtain ordering information for this method:
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