Bused on dimensional analysis, an experimental relation for predicting the flow in a 90-degree branch channel, with subcritical flow in the main and supercritical flow in the branch, has been developed.The discharge distribution Qb/Qi, where Qb is the discharge in the branch channel and Qt is the discharge in the main channel, varies linearly with the F 0 , the Froude number in ihe main channel upstream of the branch, for a constant LIB ratio in the range LIB = 1/4 to 1 and Fo = 0.2 to 0.S, where L is the width of the branch and B is the width of the main channel.The discharge distribution decreases as the Froude number increases.
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Krishnappa et al. (1963) studied this question.