The carrying capacity of a valid channel section of specifications: bottom width \(60\) m, depth of flow \(30\) cm, bed slope \(1\) per kilometer and Manning's roughness coefficient \(0.04\) will be
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Manning’s equation for open channel flow:
\[
\boxed{
Q = \frac{1}{n}AR^{2/3}S^{1/2}
}
\]
For wide rectangular channels:
\[
\boxed{
R \approx y
}
\]
where \(y\) is the flow depth.