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<math>\frac{H_2}{H_1} = \frac{1}{2}(\sqrt{8{F_1^2} + 1} - 1)</math>
<math>\frac{H_2}{H_1} = \frac{1}{2}(\sqrt{8{F_1^2} + 1} - 1)</math>
where <math>F_1 = \sqrt{g}{Y_1}</sqrt></math>
where <math>F_1 = \sqrt{gY_1}</math>
F_1 is called the Froude number, g is the acceleration due to gravity, and Y_1 is the depth of the water.
F_1 is called the Froude number, g is the acceleration due to gravity, and Y_1 is the depth of the water.