A number of different conditions and the structures that best fit the need in each case are presented in the Structure Selection Chart. 2 Case No. 3. 2 Case No. 4. Case No. 6. 2 Pipe spillway may have a canopy, hood, morning glory or drop inlet plus an emergency spillway where feasible.
Several waterways discharge into a natural drainageway.
Solution No. 1. Place a structure at the end of each waterway. Solution No. 2. Connect two or more waterways with a diversion and carry water to a common structure. Solution No. 3.