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A 4 m wide rectangular channel, having bed slope of 0.001 carries a discharge of 16 m³/s. Considering Manning's roughness coefficient = 0.012 and g = 10 m/s², the category of the channel slope is

1. horizontal
2. mild
3. critical
4. step

Correct answer: mild

Solution

A channel is classified as mild when its slope is less than the critical slope but greater than zero, allowing for a smooth flow regime. Given the bed slope of 0.001 and the discharge, the channel does not meet the criteria for horizontal or critical slopes, thus categorizing it as mild.

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