Ill. Admin. Code tit. 35, § 570.APPENDIX F
| Type | Maximum Flow* Qf (gpm) | Minimum Slope (%) | Design Velocity (fps) | Materials | Dimensions |
| Pipe | 179 | 0.5 | 2 | PVC | 6" diam |
| 332 | 0.4 | 2 | PVC | 8" diam | |
| Open Channel | |||||
| Rectangular | 224 | 0.33 | 2 | Concrete, Wood, Asphalt, Aluminum | 6" x 6" |
| Trapazoidal | 224 | 0.37 | 2 | Concrete, Wood, Asphalt, Aluminum | b = 6" S = 2:1 d = 3' |
Mannings Equation with n = 0.013

Pipe Rectangular Trapazoidal