Q3) A rectangular concrete box culvert has a length of 35 m, width of 4.2 m, longitudinal slope of 0.003 m/m and Manning's n =0.017. The inlet is square edged (kL = 0.5 and Cd = 0.62), and for the outlet assume kL = 1.0. The maximum permissible headwater depth is 2.2 m and the tailwater depth is equal to the normal depth in the rectangular river channel of the same width and bed slope as the culvert, but with Manning's n = 0.032 (natural stone). 3). Calculate the normal depth and the critical depth of flow in the river for a discharge of 13.8 m 3/s. b). Determine the height of the box culvert for a discharge of 13.8 m 3/s and sketch the flow profile through the culvert using Figure 2. c). Using the culvert height from part b, calculate the headwater depth if the culvert is to convey a flood discharge of 18 m3/s. Note, that you need to recalculate the normal depth in the river for the flood discharge.

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