What are the design requirements for wet well, basin, tank or reservoir overflows?
Overflows of wastewater must be contained and not allowed to spill onto the ground. If the overflow from a storage vessel is not connected to a sewer or the head works of the plant a suitable means of onsite containment must be included in the design. Typically, lined onsite emergency retention basins are used to contain an overflow.

Counter-weighted flapper valves or self-sealing valves which open and close automatically when an overflow occurs must be installed on the end of the overflow discharge pipe to control odors and prevent the ingress of birds and insects. For more information, please call 602-372-2861.

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1. Is emergency power required for a wastewater treatment plant and collection system lift stations?
2. Is emergency power required for collection system odor control stations?
3. What are the design requirements for equipment and process redundancy for a wastewater treatment plant?
4. What are the requirements related to the rated capacity of a wastewater treatment plant?
5. What are the minimum setback requirements for a wastewater treatment plant?
6. What are the design requirements for venting wet wells, dry wells, basins, tanks and reservoirs?
7. What are the design requirements for wet well, basin, tank or reservoir overflows?