Find the most economical cross-section of a rectangular channel which is to be dug in the rocky portion of a soil. The channel is to convey 8 m3/s of water with an average velocity of 2 m/s. Take Chezy’s constant C = 65. a. b = 0.9 m; y = 1.085 m b. b = 5.93 m; y = 4.8 m c. b=2.828 m , y= 1.414 m d. b = 1.154 m; y = 0.577 m

Structural Analysis
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Find the most economical cross-section of a rectangular channel which is to be dug in the rocky portion of a soil. The channel is to convey 8 m3/s of water with an average velocity of 2 m/s. Take Chezy’s constant C = 65.
a.
b = 0.9 m; y = 1.085 m
b.
b = 5.93 m; y = 4.8 m
c.
b=2.828 m , y= 1.414 m
d.
b = 1.154 m; y = 0.577 m
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