Water isflowing steadily in a 0.6-m wide rectangular open channel at a rate of 0.3 m3/s. If the depth is 0.15 m, a) determine i) the flow velocity, ii) hydraulic radius and iii) the specific energy. b) Is the flow subcritical or supercritical?

a) i) , ii) , iii) , b) (Supercritical).

Explanation:

a) i) The flow velocity of water is:

ii) The hydraulic radius of the channel:

iii) Let assume that height is equal to zero. Then, the specific energy is:

b) The characteristics of the flow in the open channel is inferred from the Froude number, whose formula is:

As , then flow is supercritical.

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