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how to find the discharge of rain water by using orifice meter???

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Rotameter is suitable for measuring rain fall discharge.If we consider orifice or venturi losses will be there and also these are mainly useful for horizontal flow. Rotameter is a variable area device and it works on principle of balance of gravity forces (act down ward),drag ,buoyancy forces(act upward).And is have standard scale for measure flow rate,it gives direct value of the discharge(Q)
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