Open Channel Flow 
Open channel flow. Compute hydraulic radius, wetted perimeter, and area for circular culvert 

Open channel flow units: (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. Open Channel Flow Culvert Geometry Diagram and Equations: 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. Open channel flow circular culvert geometry calculation does not check for unreasonable inputs. For open channel flow, please enter 0<y<d, 0<T<d, and d>0.
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