What is Hydraulic Radius

Question

Im stuck and i Dont know how to say it simply

Answer 1

I don't know

google it.

=]

Answer 2

Measure of a river's channel efficiency (its ability to move water and sediment), used by water engineers to assess the likelihood of flooding. The hydraulic radius of a channel is defined as the ratio of its cross-sectional area to its wetted perimeter (the part of the cross-section – bed and bank – that is in contact with the water).

The greater the hydraulic radius, the greater the efficiency of the channel and the less likely the river is to flood. The highest values occur when channels are deep, narrow, and semi-circular in shape.