Hydraulic Radius - Open Channel
Hydraulic Radius - An important calculation that is important for the use in finding flow rates - usually used in conjunction with the Reynolds number.
There is " open channel flow " like channels and creeks
As well as " closed flow " like pipes and closed vessels
Reynolds number refers to the turbulence or lack of turbulence of the a fluid. < 2000 laminar
> 2000 Turbulent