Question

A rigid boundary rectangular channel having a bed slope of $\frac{1}{800}$ has its width and depth of flow equal to 2m and 1m respectively. If the flow is uniform and the value of Chezy's constant is 60, the discharge through the channel is

• A. $1.0m^3/s$
• B. $2.0m^3/s$
• C. $1.5m^3/s$
• D. $3.0m^3/s$

Answer 1

The correct option is D $3.0m^3/s$

Hydraulic depth,

$R=\frac{A}{P}=\frac{2\times 1}{2\times 2}=0.5m$

$Q=A\times C\sqrt{RS}=60\times \sqrt{0.5\times \frac{1}{800}}\times 2\times 1$

$=3.0m^3/s$