Well few things to clarify...rectangular closed conduit; is it totally filled or partially filled? If it is a partially filled, no matter whether it is closed, it follows the open channel hydraulics.
Wetted perimeter is just the geometric perimeter in both cases then.
Thanks.
Yes, for fully filled conduit. So, in that case, I may take P = 2*(b+y)
Fully filled conduits are pressure driven and why do you need the wetted perimeter?
Well in addition, you use wetted perimeter for open channels and for mannings equation.
What is the requirement in closed conduits?
I am designing a dual layer channel. The upper part is an open channel with a suitably perforated bottom and the lower part is a rectangular *closed* duct. The whole unit flows by gravity and *subject to atmospheric pressure* since the half of the top surface of the*closed* duct made out of perforated material. So; I want to come up with a practicable formula which is applicable to this kind of situation.
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