Geometric Calculations for Circular Partially Filled Culverts |
The open channel flow calculations website |

Manning Equation Calculator Unit
Conversions |

You may enter numbers in any units, so long as you are consistent. (L) means that
the variable has units of length (e.g. meters). (L^{2}) means that the
variable has units of length squared (e.g. m^{2}).

Top width, T, is the top width of the water in the pipe. T=0 if the pipe is empty or
full.

Equations:

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