4ft (w) x 3 ft(d) box concrete culverts (n=0.013, entrance has 90-degree and 15-degree wingwall flares) carry 150 cfs along a 31-m length of pipe constructed at 1.0 % slope. the tailwater depth is 2 ft.

(a) what is the headwater depth?

(b) are the culverts flowing under inlet or outlet control conditions?

(c) what would the headwater depth and flow regime for a flow rate of 190 cfs?

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