CivilStructural.com.my 25 Aug 2013
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Civil and Structural Engineering

Manning Formula Calculator


New Q=1/n*R^(2/3)*S^(1/2)*A

n= manning coefficient
S=hydraulic gradient(m/m)
R=hydraulic radius(m)
A=area of section(m²)

n= R=
S= A=
Q= m³/s



New Q=1.49/n*R^(2/3)*S^(1/2)*A

n= manning coefficient
S=hydraulic gradient(ft/ft)
R=hydraulic radius(ft)
A=area of section(ft²)

n= R=
S= A=
Q= m³/s



(Updated 18/5/07)
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