Hydraulic radius for the cross - section of a river is : Select one :
a . Area / Wetted perimeter
. b . Wetted perimeter / Slope .
c . area / slope
d. Wetted perimeter / Area .
Finding out hydraulic radius of the cross section of the river.
Hydraulic radius is defined as the area of the cross section divided by wetted perimeter.
So option A is the correct one.