Open Channel Flow Model using Manning Formula
Instructions
Choose particular values of hydraulic gradient s, and Manning's roughness coefficient n, and we fixed the area as A = 15 square metres in this case.
Move the red coloured point to vary the width of the drain cross-section.
With area kept constant at A = 15 sq m, the height will vary automatically.
What you observe about the velocity V?
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?