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The properties of a standard hydraulic jump depend critically on a Froudenumber Fr defined as the ratio of the flow velocity to the gravity waves speed.In the case of a horizontal circular jump, the question of the Froude number isnot well documented. Our experiments show that Fr measured just after the jumpis locked on a constant value that does not depend on flow rate Q, kinematicviscosity {\nu} and surface tension {\gamma}. Combining this result to alubrication description of the outer flow yields, under appropriate conditions,a new and simple law ruling the jump radius RJ : $R_J (ln(\frac{R_\infty}{R_J}))^{3/8} \sim Q^{5/8}\nu ^{-3/8}$, in excellent agreementwith our experimental data. This unexpected RJ result asks an unsolved questionto all available models.

Constant Froude number in a circular hydraulic jump and its implication on the jump radius selection