(2)Prove the following three formulas of the equivalent roughness n of a compound channel: (2nfra ) (En} P;)] 3 3 1 n =
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(2)Prove the following three formulas of the equivalent roughness n of a compound channel: (2nfra ) (En} P;)] 3 3 1 n =
(2)Prove the following three formulas of the equivalent roughness n of a compound channel: (2nfra ) (En} P;)] 3 3 1 n = ) 5 PR3 n = 5 Σ PR ni 2 P3 n = 1 P2
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