- (a) Aerated lagoon piping systems shall be designed to avoid areas of stagnation, short circuiting, solids deposition, or dead zones in the lagoons.
- (b) Inlet piping shall be located 1/5 to 1/3 of the total water depth from the lagoon bottom, but not less than 2 feet above the bottom of the lagoon bottom. On lagoons 150 or more feet wide, multiple inlets shall be used to enhance distribution of the influent flow.
- (c) Outlets shall be designed to provide multiple draw-off levels. Draw-off capability shall be provided over as much of the operating depth as feasible.
- (d) All aerated cells shall have influent lines which distribute the load within the mixing zone of the aeration equipment to minimize short-circuiting.
- (e) The influent line shall discharge vertically on to a concrete apron no smaller than 4 square feet to prevent scouring and erosion.
Source. (See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06; ss by #10693, eff 10-15-14; ss by #14258, eff 7-1-25, EXPIRES: 7-1-35