Flow Approaching Filter Washwater Troughs

by Jonathan A. French, (M.ASCE), Sr. Hydr. Engr.; Camp Dresser and McKee, Inc., One Center Plaza, Boston, Mass. 02108,

Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 2, Pg. 359-378

Document Type: Journal Paper


A potential flow model is used to study the flow of backwash water, laden with filtered solids, in its progress from the top of the filter bed to the washwater troughs above the filter. For backwashing effectiveness and economy, it is of interest to minimize the region of nonuniform flow between troughs. The best practical dimensions for promoting uniform flow beneath and between the troughs are determined. For this optimal trough design and two alternative designs, the paths and travels times of fluid elements and suspended particles are studied. Factors affecting trough spacing are also considered.

Subject Headings: Filters | Potential flow | Water flow | Backwashing | Nonuniform flow | Travel time | Hydrologic models | Solids flow

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