Guest Column | August 6, 2015

Math Solutions: Wet Well Flow Rate Calculations

Wastewater Dan Theobald

By Daniel Theobald, "Wastewater Dan"

Water Online’s “Math Solutions” series, presented by wastewater consultant and trainer Dan Theobald (“Wastewater Dan”), instructs operators on a variety of calculations necessary for plant operations and operator certification. Here Dan tackles wet well calculations, with a bonus calculation for determining flow in cubic feet.

Calculate flow entering wet well – presented in three installments:

1.) Calculate Gallons Of Wet Well Effluent:

2.) Calculate Gallons Of Wet Well Level Increase:

3.) Calculate GPM Of Wet Well Influent:

Calculate flow rate in cubic feet per second:

Complete playlist of Wastewater Dan’s Math Solutions

This is the ‘Wet Well Flow Rate Calculations' presentation in my series of “Math Solutions.” If you have specific wastewater math queries, please submit a question.

About Dan Theobald:

Known in the industry as “Wastewater Dan,” Daniel L. Theobald, proprietor of Environmental Services (, is a professional wastewater and safety consultant/trainer. He has more than 24 years of hands-on industry experience operating many variants of wastewater treatment processing units and is eager to share with others his knowledge about water conservation.

Theobald serves as an active consultant for industries looking to achieve and maintain improved wastewater treatment at reduced cost. He is a Lifetime Member of the Who’s Who Registry of Professionals and holds numerous certifications from wastewater management regulatory boards and professional organizations. Theobald contributed one chapter to the Water Environment Federation’s ( Manual of Practice # 37 (MOP-37), a technical manual resource guide for biological nutrient removal, published in 2013.