Performance Characteristics of Compound Weirs

by Tsan-wen Wang, Natl Taiwan Univ, Taiwan,
M. Akhtar Abbas, Natl Taiwan Univ, Taiwan,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A theory is outlined which helps to explain the flow over compound weir under free overfall conditions. Experiments on twelve weirs of three sets with different dimensions are shown to confirm the trends predicted by theory. An experimental discharge equation of the form Q = KHn is formulated. The average value of K is found to be 3.30 for all weirs. Whereas the average exponent of head n is found to be 2.75. An accurate method for determining the discharge coefficients (C1 & C2) for theoretically derived equation is suggested. It is found that C1 varies within the range of 0.513 to 0.908 while C2 varies from 0.673 to 0.543. The comparison indicates a simple prediction of all pertinent flow characteristics. It is concluded that the V-notch characteristics are dominant in this type of compound weir.

Subject Headings: Weirs | Flow measurement | Free flow | Comparative studies | Fluid mechanics | Water discharge | Flow patterns | Hydraulics

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