Hydraulic Radius Calculator

Enter value and click on calculate. Result will be displayed.
Select calculator :
 
Area of Section Flow (A) :
m2
Wetted Perimeter (Pw) :
m
Result:

What is a Hydraulic Radius Calculator?

A Hydraulic Radius Calculator is a tool used to determine the hydraulic radius (R) of a channel or pipe, which helps measure the efficiency of fluid flow. It is defined as the ratio of the cross-sectional area of flow to the wetted perimeter.

Why Use a Hydraulic Radius Calculator?

  • Essential in hydraulics and fluid mechanics for analyzing open channels and pipes.
  • Helps in designing canals, sewers, and drainage systems for efficient water flow.
  • Used in calculating flow velocity and resistance in engineering applications.

How to Calculate Hydraulic Radius?

The formula is:

R=A/P

Where:

  • R = Hydraulic radius (m or ft)
  • A = Cross-sectional area of flow (m² or ft²)
  • P = Wetted perimeter (m or ft)

Example:
If a rectangular channel has a width of 3 m and a water depth of 2 m,

  • A = 3 × 2 = 6 m²
  • P = 3 + 2 + 2 = 7 m
R=6/7=0.86 m

When to Use a Hydraulic Radius Calculator?

  • Designing rivers, canals, and drainage systems.
  • Evaluating water flow in pipes and sewers.
  • Calculating flow resistance using the Manning equation.
  • Improving irrigation systems and flood control projects.