In the design of dry well pumping stations, which arrangement is better, “turned-down” bellmouth or horizontal intake?

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Pumps can be installed as dry well or wet well. The wet well is commonly used because of its simplicity and low cost. However, this type of pump arrangement has the potential problem of maintenance. For instance, it requires the de-watering of sump and removal of pumps out of the sump, which is suitable for stormwater pumping station which does not require pumping for most of the time. For dry well, the pumps could be assessed and maintained all of the time.

In general “turned-down” bellmouth of pump inlet is more popular because of the following two reasons:

(i) It is less susceptible to vortex action with similar water height.
(ii) It accommodates a lower water cover.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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