1. (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.
2. (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.
3. (c) Park drainage systems installed without P-traps or vents may be sized for individually vented systems in accordance with Table 1268-1.

4. (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 ½

   5

   11

   12

   3

Note: Authority cited: Section 18300, Health and Safety Code. Reference: Section 18630, Health and Safety Code.

History

1. Amendment filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28).