Compound Weir Discharge

by Fred W. Blaisdell, (F.ASCE), Research Hydr. Engr.; U.S. Dept. of Agr., Sci. and Education Administration, Agricultural Research, St. Anthony Falls Hydr. Lab., Minneapolis, Minn.,
Clayton L. Anderson, (M.ASCE), Hydr. Engr.; U.S. Dept. of Agr., Sci. and Education Administration, Agricultural Research, St. Anthony Falls Hydr. Lab., Minneapolis, Minn.,


Serial Information: Journal of the Hydraulics Division, 1979, Vol. 105, Issue 7, Pg. 817-826


Document Type: Journal Paper

Abstract: A mathematical model for computing the discharge over a compound weir was developed by separating the weir shape into geometrical elements, computing the discharge through each element using well-known equations for weirs and orifices, and summing the individual discharges through each element. The method was checked and the discharge coefficients were evaluated by a physical model. The accuracy obtained was well within practical needs. The results obtained suggest that similar methods can be used for related practical applications. The weir modeled was U shaped in plan. When linearized the shape was a high level trapezoid superimposed on a low level trapezoid. To prevent overbank flow from dropping into the channel and eroding the channel banks near the spillway, the low weir was sized to have a capacity equal to that of the approach channel at bank-full dishcarge.

Subject Headings: Weirs | Water discharge | Physical models | Computer models | Mathematical models | Geometrics | Linear functions

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