The discharge in a rectangular channel of width 6 m with Manning's ????=0

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The discharge in a rectangular channel of width 6 m with Manning's ????=0.012 m−13⁄ s is 24 m3 s-1. If the streamwise slope is 1 in 200 find:

(a) the normal depth;

(b) the Froude number at the normal depth;

(c) the critical depth.

State whether the normal flow is subcritical or supercritical.