Characteristic of Flow Over Semicircular Submerged Weir

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  C. H. Hayawi   |   

The main object of this investigation is to obtain convenient expressions for the estimation of discharge coefficient for submerge flow over concave and convex semicircle shape crested weirs. Sixteen weir models were constructed and tested, these models were classified into four groups. The first and second groups were of single cycles having concave and convex shapes, respectively, with a curvature radius of 15 cm. The third and fourth groups were of double cycle having concave and convex shapes, respectively, with a curvature radius of 7.5 cm. In each group, the weir height p was varied four times 10 cm, 7.5 cm, 5 cm, and 2.5 cm. Based on the results of this study it was found that for constant weir radius, R, the discharge coefficient Cd, increases with the increase in the relative upstream head, h/p, while, for the constant upstream head, weirs of mall heights give a higher discharge coefficient than those of large height. Two general expressions were obtained for the estimation of Cd as a function of relative upstream head h/p, and relative radius R/P, one expression for single and double-cycle concave submerged weirs and the other for convex submerged weirs.