2.0 SYSTEM DESIGN
© Presby Environmental, Inc., Design & Installation Manual, September 2020 Edition
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Illustration of multiple beds at same elevation:
Illustration of multiple beds at different elevations:
Angled and Curving Beds
Angled and curving beds are used to avoid obstacles and work well around structures, setbacks, and slopes.
Multiple curves can be used within a system to accommodate various contours of the site.
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Rows are angled by bending pipes up to 90 degrees or through the use of offset adapters
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Rows shall meet requirements outlined in the design criteria above.
Illustrations of angled and curving beds:
2.6 Pump Systems
Pumped systems supply effluent to the system using a pump and D-box when site conditions do not allow for a
gravity system. Dosing siphons are also an acceptable means of delivering effluent to the system.
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Pump volume per dose shall be no greater than 1-gallon times the total linear feet of AES pipe.
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Pump dosing should be designed for a minimum of 6 cycles per day; 6-8 cycles per day are recommended.
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If possible, the dosing cycle should provide one hour of drying time between doses.
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Pump systems must have a high-water alarm float or sensor installed inside the pump chamber. Follow
state, local and national code requirements.
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All pump systems require differential venting.
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All pumped systems require a D-box with baffles, a velocity reducing tee or other means to be used for
velocity reduction.