A road embankment with a height of Nnas, a subgrade wid

A road embankment with a height of Nnas, a subgrade width of B = 12 m and a steepness of slopes of m = 1.5, crosses a watercourse with a variable flow rate, in order to pass it, a round reinforced concrete pipe with a streamlined head is laid in the body of the embankment with it.
Given: Qmax = 3.9m3 / s; i m = 0.006m; Nnas = 3.6m.
It is required:
1. Choose the pipe diameter for the flow passage Qmax in the pressure mode with an allowable water velocity in the pipe vdop = 4 m / s and a minimum allowable distance from the embankment edge to the retaining level amin = 0.5 m.
2. Determine the actual speed of water in the pipe vf when missing the maximum flow rate and the depth H of water in front of the pipe, corresponding to this flow rate.
3. To calculate the marginal costs and the corresponding depths in front of the pipe, at which the pipe will work in pressure-free and semi-pressure modes.
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