(a) Each lot drain inlet shall be assigned a waste loading value of six (6) fixture units and each park drainage system shall be sized according to Table 1268-1 or as provided herein. Drainage laterals shall be not less than three (3) inches in diameter.(b) A park drainage system in which the grade, slope, or sizing of drainage pipe does not meet the minimums specified in Tables 1268-1 or 1268-2 shall be designed by a registered engineer for a minimum velocity flow of two (2) feet per second.(c) Park drainage systems installed without P-traps or vents may be sized for individually vented systems in accordance with Table 1268-1.(d) A park drainage system which exceeds the fixture unit loading of Table 1268-1 shall be designed by a registered engineer. TABLE 1268-1 |
Drainage Pipe Diameter and Number of Fixture Units on Drainage System |
|
| Size of Drainage Pipe (Inches) | Maximum No. of Fixture Units Individually Vented System | Maximum No. of Fixture Units Wet Vented System | Terminal & Relief Vent Wet Vented System (Inches) |
| 3 | 35 | 14 | 2 |
| 4 | 180 | 35 | 3 |
| 5 | 356 | 180 | 4 |
| 6 | 600 | 356 | 4 |
TABLE 1268-2 |
Minimum Grade and Slope of Drainage Pipe |
|
Pipe Size (inches) | Slope per 100 ft. (inches) | Pipe Size (inches) | Slope per 100 ft. (inches) |
| 2 | 25 | 6 | | 8 |
| 3 | 20 | 8 | | 4 |
| 4 | 15 | 10 | | 3 1/2 |
| 5 | 11 | 12 | | 3 |
Cal. Code Regs. Tit. 25, § 1268
1. Amendment filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28). Note: Authority cited: Section 18300, Health and Safety Code. Reference: Section 18630, Health and Safety Code.
1. Amendment filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28).