All sewer lines shall be located in trenches of sufficient depth to be free of breakage from traffic or other movements and shall be separated from the park water supply at a safe distance. Sewers shall be at a grade which will insure a velocity of two feet per second when flowing full. All sewer lines shall be constructed of materials approved by the city, shall be adequately vented, and shall have watertight joints.
(Ord. No. 711, 11-11-69)