Taking account of turbulence intensity, non-uniformity of velocity distribution at the initial and sequent sec-tion of hydraulic jump and frictional drag on the floor within jump range, this paper derives new formulas for cal-culating the ratio of conjugate depths and the efficiency of energy dissipation in the two-dimensional free hydraulicjump. It has been verified by test data that the new formulas are not only exact in theory but also still better inconformity with practice.
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