For a circular sewer running partially full, the proportionate wetted perimeter is given by:

1
\(\frac{p}{P}=\frac{D}{4}\)
2
\(\frac{p}{P}=\frac{\alpha}{360^0 }\)
3
\(\frac{p}{P}=\frac{\alpha}{\pi D}\)
4
\(\frac{p}{P}=\frac{\alpha}{180^o}\)

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