CE Board HGE Problem 69 (Hydraulics and Geotechnical Engineering)

(CE April 2024) An irrigation canal with trapezoidal cross-section has the following dimensions:

Bottom width = 2.50 m
Depth of water = 0.90 m
side slope = 1.5 H to 1 V
Coefficient of Roughness = 0.025
Slope of channel bed = 0.001

The canal will serve clay-loam Riceland for which the duty of water per hectare is 3 Liter / sec. Using Manning’s Formula, estimate the number of hectares served by the irrigation canal