Theoretical end-depth-discharge relationship for free overfall

Despite the many theoretical and experimental studies carried out in channe ls having different cross-section shape, slope, and roughness, the problem of the free overfall as a how measuring device has not been completely solv ed, and other experiments are needed. A theoretically based end-depth-disch arge relationship is obtained for both subcritical and supercritical how in rectangular, triangular, and trapezoidal channels. For each cross-section shape, discharges predicted using the theoretical relationship are compared with the available experimental data.