Circular Culvert Geometry 
Compute hydraulic radius, wetted perimeter, and area 

Circular culvert geometry calculation is mobiledevicefriendly as of August 4, 2014 Units in culvert geometry calculator: 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}). For instance, enter d, y, and T all in meters or all in inches or all in feet. Diagram and Equations for culvert geometry calculator: Top width, T, is the top width of the water in the pipe. T=0 if the pipe is empty or full. T=d if the pipe is half full. The circular culvert geometry calculation does not check for unreasonable inputs. Please enter 0<y<d, 0<T<d, and d>0.
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