Any shape conduit can be represented by its crosssectional a

Any shape conduit can be represented by its cross-sectional area divided by wetted perimeter, which is called:

(a) Hydraulic radius

(b) Non-circular conduit

A) Hydraulic Radius.

The ratio of flow area/ wetted perimeter is known as Hydraulic Radius. Usually denoted by \"R\" .

for circular pipe of dia \"D\" carrying discharge the hydraulic radius will be R=( D^2/4)/D = D/4