Wastewater pumping stations can have both submersible and dry pit end suction pumps and be cost effective to operate and construct. Knowing the hydraulic limits of a wet well is the challenge to the design engineer. Physical modeling and numerical analysis computer programs are tools
that the design engineer can use to aid in the evaluation of pumping station wet wells. A physical model was used in the evaluation of a 10 mgd raw sewage pumping station. The model results determined that the most practical method of increasing the capacity of the facility was to construct
a new and larger wet well to reduce the damaging effects of pre-rotation and vortices. Challenges to the designer as well as contractor are discussed in this paper.
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