A 6-m-wide rectangular irrigation channel carries a discharge of 20.0 m3/sec. The channel has a slope of 0.02 and a Manning’s coefficient is n = 0.01. Determine the normal depth. Use both the full expression of the hydraulic radius and the wide channel approximation. a) Assume wide channel and compute the normal depth as the slope decreases from 0.02 down to 0.002 at increments of 0.002. Compute also the corresponding water speed. Plot the normal depth as function of the slope. b) Assume wide channel and compute the normal depth as the Manning’s coefficient increases to 0.1 at increments of 0.01. Compute the corresponding water speed. Plot the normal depth as function of the Manning’s coefficient.
A 6-m-wide rectangular irrigation channel carries a discharge of 20.0 m3/sec. The channel has a
slope of 0.02 and a Manning’s coefficient is n = 0.01. Determine the normal depth. Use both the
full expression of the hydraulic radius and the wide channel approximation.
a) Assume wide channel and compute the normal depth as the slope decreases from 0.02
down to 0.002 at increments of 0.002. Compute also the corresponding water speed.
Plot the normal depth as function of the slope.
b) Assume wide channel and compute the normal depth as the Manning’s coefficient
increases to 0.1 at increments of 0.01. Compute the corresponding water speed. Plot the
normal depth as function of the Manning’s coefficient.
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