Wastewater Wetwell Shape
Wastewater Wetwell Shape
(OP)
We use a round wet well made by concrete precast plants. We also use duplex pump arrangements, and soemtimes triplex submersible pumps. Our wet wells range in size from 6 ft ID to 12 ft ID. We also line ours with a tough PVC liner for corrosion protection. On a recent trip to a precast plant I saw they had several other pre-cast shapes in their yard for other customers, such as the D.O.T. That gave me pause to think about why we use round wet wells. Is it because we've always done it that or or did this evolve from practical lessons learned?
I'd like some feed back from readers around the globe on what shape you have found best to use for wet wells and why. Do you use round or rectangular shaped, and why or why not. Do you add fillets to the corners to mitigate against the accumulation of debris? What other tips, and lessons learned can you share to help the O&M function?
I'd like some feed back from readers around the globe on what shape you have found best to use for wet wells and why. Do you use round or rectangular shaped, and why or why not. Do you add fillets to the corners to mitigate against the accumulation of debris? What other tips, and lessons learned can you share to help the O&M function?





RE: Wastewater Wetwell Shape
good luck
RE: Wastewater Wetwell Shape
I prefer no corners to corners (ei, round). But, I must admit, I have no imperical evidence. It is, as you've suspected, probably just because "that's how I've always done it".
I was, however, once given a "go-by" plan set by a Municipal Authority - meaning what they wanted to end up with (the Authority was to ultimately own/O&M). The wetwell was rectangular, so I designed mine rectangular and sealed the design. The Auth has several rect. in service, and I just couldn't find any iron-clad reason not to give them what they asked for. However, they had no specific reason why they wanted rect. It seems to me, as you've suspected, probably just because "that's how they've always done it".
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RE: Wastewater Wetwell Shape
RE: Wastewater Wetwell Shape
RE: Wastewater Wetwell Shape
However, the perimeter of a square wet well with area 10 sq ft is 12.65 ft (longer for a rectangle), while in a round wet well with area 10 sq ft, the perimeter is 11.21 ft. On a wet well of this scale, the saving in materials cost may be trivial, of course, and the benefit of things fitting better into a square may override.
RE: Wastewater Wetwell Shape
RE: Wastewater Wetwell Shape
good luck
RE: Wastewater Wetwell Shape
http://www.engdyn.com/papers/abstracts/ab91.htm