Figure 13-29 shows an existing road and existing culvert consisting of three 30-inch concrete pipes. Evaluate the hydraulic adequacy of the culvert for a design discharge of 152 cfs and AHE equal to...

Figure 13-29 shows an existing road and existing culvert consisting of three 30-inch concrete pipes. Evaluate the hydraulic adequacy of the culvert for a design discharge of 152 cfs and AHE equal to the top of road, or elevation 320.9. Computed tailwater depth is 3.25 feet, giving a tailwater elevation of 320.00.

If the culvert is inadequate, design a replacement culvert using flared wingwalls and a square edge entrance. Also design riprap outlet protection if needed. Keep in mind that the culvert crown cannot be made much higher because of the existing road. Figures 13-30 and 13-31 show profiles of Brickel Avenue and the stream, respectively.