| TABLE 18 | ||||
|---|---|---|---|---|
| Hydraulic Elements of Sewer Sections. Sewers Flowing Full. | ||||
| Section | Area in Terms Vertical Diameter Squared D2 | Hydraulic Radius in terms of Vertical Dia. D | Vert. Dia. D in Terms of Dia. d of Equivalent Circular Section | Source |
| Circular | 0.7854 | 0.250 | 1.000 | |
| Egg | 0.5150 | .1931 | 1.295 | Eng. Record, Vol. 72: 608 |
| Ovoid | 0.5650 | .2070 | 1.208 | Eng. Record, Vol. 72: 608 |
| Semi-elliptical | 0.8176 | .2487 | 1.041 | Eng. News, Vol. 71: 552 |
| Catenary | 0.6625 | .2237 | 1.1175 | Eng. Record, Vol. 72: 608 |
| Horseshoe | 0.8472 | .2536 | 0.985 | Eng. Record, Vol. 72: 608 |
| Basket handle | 0.8313 | .2553 | 0.979 | Eng. Record, Vol. 72: 608 |
| Rectangular | 1.3125 | .2865 | 0.7968 | Hydraulic Dgms. and Tbls. Garrett |
| Square (3 sides wet) | 1.0000 | .333 | 0.7500 | Eng. Record, Vol. 72: 608 |
| Square (4 sides wet) | 1.0000 | .250 | 1.0000 | Eng. Record, Vol. 72: 608 |
1. Standard Egg-shaped Section, North Shore Intercepter, Chicago, Illinois.
2. Rectangular Section, Omaha, Nebraska, Eng. Contracting, Vol. 46, p. 49.
3. Trench in firm ground. 4. Trench in Rock.
Note.—Underdrains and Wedges to be used only when Ordered by the Engineer.
7. Brick and Concrete Sewer showing cunette.
