SSC JE Civil Engineering 25-Sep-2019 Shift 1 Solved Paper

In an open channel flow, hydraulic radius, R=

A

P

, is the ratio of the water area to its wetted perimeter of the cross section.
Water area(A): It is the cross-sectional area of the flow normal to the direction of flow.
Wetted perimeter (P): It is the length of the line of intersection of the channel wetted surface with a cross-sectional plane normal to the direction of flow.