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Outlet Weir Loadings for Settling Tanks

S. David Graber
Journal (Water Pollution Control Federation)
Vol. 46, No. 10 (Oct., 1974), pp. 2355-2362
Stable URL: http://www.jstor.org/stable/25038272
Page Count: 8
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Outlet Weir Loadings for Settling Tanks
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Abstract

Complex and costly outlet weir configurations are commonly provided on settling tanks for the purpose of limiting weir "loadings," defined as the volume rate of flow per unit length of weir. In order to evaluate the rationale for weir loading limitations, an investigation was conducted that included a thorough literature review, critical evaluation of existing theories, and the development of an improved theory. Outlet weir configurations for primary settling tanks that are recommended are those based on the conclusion that weir loadings need not be limited out of concern for settling efficiency. Outlet weir design for secondary settling tanks is also discussed, with the emphasis placed on the significance of density currents and their relation to weir requirements.

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