V‐Notch Weir Calibration Using New Parameters
Publication: Journal of Hydraulic Engineering
Volume 112, Issue 4
Abstract
Monitoring of wastewater discharge requires measurements of both quality and quantity to satisfy federal regulations. The use of 90-degree V-notch weirs to measure discharge at outfalls is common. In many instances the weirs are placed in culverts or other space-limited locations such that the traditional calibration parameter, head over the weir notch, is difficult to measure. Two other parameters can be specified, which involve measurements at the weir plate. These have the advantage of not requiring that an elevation datum be established. The first is measurement of depth of flow over the weir notch using a common meter stick. The second is the measurement of width of flow at the weir crest using a modified machinist's caliper. Both techniques yielded reliable measurements using a sample data set obtained from 12 students asked to perform the measurements. Measured discharge varied no more than ± 5% from actual at one standard deviation, and no more than ± 10% at two standard deviations. It was concluded that the two new parameters were adequate substitutes for traditional weir head measurements.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Blaisdell, F. W., “Discharge of V‐Notch Weirs at Low Heads,” Civil Engineering, Vol. 9, No. 8, Aug., 1939, pp. 495–496.
2.
NPDES Compliance Sampling Manual, US Environmental Protection Agency, 1977.
3.
Pierce, C. H., “Experiments on Weir Discharge,” Proceedings of the American Society of Civil Engineers, Apr., 1913, No. 41650F, p. 847.
4.
Schoder, E. W., and Turner, K. B., “Precise Weir Measurements,” Transactions of the American Society of Civil Engineers, No. 93, 1929, pp. 999–1110.
5.
Steward, W. G., and Longwell, J. S., “Experiments on Weir Discharge,” Proceedings of the American Society of Civil Engineers, Feb., 1913, No. 40168F, p. 458.
6.
Water Measurement Manual, US Department of the Interior, Bureau of Reclamation, 2nd ed., Denver, CO, 1967.
Information & Authors
Information
Published In
Copyright
Copyright © 1986 ASCE.
History
Published online: Apr 1, 1986
Published in print: Apr 1986
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.