Wetted Perimeter Trapezoidal Channel Formula

Equation for calculate wetted perimeter trapezoidal channel is,

p = b + 2 * ( ( ( t - b ) / 2 )² + h² )^{1 / 2}

Where,
p = Wetted Perimeter of Trapezoidal Channel
b = Bottom Width
h = Liquid Depth
T = Width of the Liquid Surface