1. The problem statement, all variables and given/known data a gemoetrical similar open chanel model is constructed with 10: 1 , if the model discharged 7m^3 /s , what is the corresponding discharge in prototype? 2. Relevant equations 3. The attempt at a solution Q = (L^3) / T , [ (Lp^3)/ (Tp) ] / [ (Lm^3) / Tm ] = (Lr^3) / Tr but , i assume (Lr^3 ) = (Lp^3) / (Lm^3) so , Qp = (5^3) x 7 = 875 m^3 /s , is it correct ? or it should be (1/125 ) x 7 = 7/725 m^3 /s ????