# Wetted Perimeter of a Trapezoidal Channel Calculator

Wetted perimeter is the perimeter of the cross sectional area of a hydraulic pipe that is wet. When a channel is much wider compared to its depth, then the wetted perimeter is approximately equal to that of the channel width. A trapezoid shape is mostly used for manmade channels and the cross section of natural stream channels. Here is an online mechanical calculator to calculate the *wetted perimeter of a trapezoidal hydraulic pipe channel.*

## Wetted Perimeter Trapezoidal Channel

Wetted perimeter is the perimeter of the cross sectional area of a hydraulic pipe that is wet. When a channel is much wider compared to its depth, then the wetted perimeter is approximately equal to that of the channel width. A trapezoid shape is mostly used for manmade channels and the cross section of natural stream channels. Here is an online mechanical calculator to calculate the *wetted perimeter of a trapezoidal hydraulic pipe channel.*

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#### Example

**A trapezoidal channel with bottom width 10m, liquid depth 8 m and liquid surface width 15 m will have wetted perimeter of
**

= 10 + 2 ( ( ( 15 - 10 ) / 2 )Â² + 8Â² ) ^{1 / 2}

=26.7631 m