Open Channel Flow Model using Manning Formula

Lew W.S.


Choose particular values of hydraulic gradient s, and Manning's roughness coefficient n, and we fixed the area as A = 15 sq metres in this cae Vary the height and width of the channel cross-section. What do you observe? Is there a maximum velocity V for the given n, s, and A ? Is the corresponding wetted perimeter P, the smallest in value when velocity V is maximum? Change values of n, s, but keep A as 15 sq m. What do you observe about the maximum V and corresponding P? Try other values of n, s, keeping A as 15 sq m. Find the maximum V and corresponding P. What is your conclusion?