A 3.5ft x 3.5 ft concrete (n=0.012) culvert is 250 ft long and laid at a slope of 0.006. The culvert entrance is flush and square-edged. The tailwater level at the outlet is just above the crown of the barrel, and the headwater is 5.0 ft above the crown of the culvert's inlet. What's the discharge? If the headwater is 1 ft above the crown of the culvert's inlet and no tailwater, what's the discharge