What are the design requirements for venting wet wells, tanks and reservoirs?
The requirements are specified in the Arizona Department of Environmental Quality's (ADEQ) Engineering Bulletin No. 10, "Guidelines for the Construction of Water Systems," Chapter 6, Section E.9.

In addition to the installation of inverted 'U' type vents, MCESD also allows the use of recent designs such as 'chair' or cross-flow vents provided that these vents have an air flow direction change of 90 degrees in the horizontal plane prior to air entering/leaving the containment vessel.

In all cases, vents shall have a 16-mesh corrosion resistant screen installed to prevent the ingress of birds and insects. For more information, download the Guidelines for the Construction of Water Systems (PDF).

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1. Is emergency power required for ground water production facilities?
2. Is emergency power required for water distribution system facilities?
3. What are the design requirements for venting wet wells, tanks and reservoirs?
4. What are the design requirements for wet well, tank or reservoir overflows?
5. What are the design requirements for entry hatches on wet wells, tanks and reservoirs?
6. Can pump seal water be discharged to a drinking water booster pump station wet well?
7. What are the disinfection requirements for commissioning piping or equipment in potable water service?