Figure 13-27 shows an existing road and existing culvert. Evaluate the hydraulic adequacy of the culvert for a design discharge of 860 cfs and AHE equal to the top of road, or elevation 184.5....

Figure 13-27 shows an existing road and existing culvert. Evaluate the hydraulic adequacy of the culvert for a design discharge of 860 cfs and AHE equal to the top of road, or elevation 184.5. Computed tailwater depth is 3.9 feet, giving a tailwater elevation of 181.3.


If the culvert is inadequate, design a replacement culvert using flared wingwalls and a square edge entrance. Also, design riprap outlet protection if needed. Figure 13-28 shows the existing stream profile.