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What is the application of inverted siphons? What are the disadvantages of using inverted siphons?

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Inverted siphons are designed at locations in which a sewer system is blocked by underground utilities or stormwater drains. They are sometimes called depressed sewers because it is claimed that there is no actual siphon action. They connect the upstream and downstream sewers with U-shaped vertical alignment such that they are always running full.

The drawbacks of inverted siphons are:
(i) They induce additional head loss to the sewer system which is undesirable in hydraulic performance;

(ii) U-shaped siphons create sediment accumulation problem and previous experience showed that inverted siphons were easily blocked due to siltation;

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(iii) Maintenance of invert siphons is difficult due to its inaccessibility.

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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  • amit bhamre June 9, 2012 at 12:06 am

    dear all, i am presently designing flooded system for petrochemical plant hence, in which a weir is provided at disposal point and the resulting flooding in junction manholes is attained such that there is waterlevel in each manhole atleast 150mm above crown of pipe, my question is can i follow the same principle as invert siphon and 2nd question is since the pipe are laid in same level is crown matching of pipes required or we can match the invert of all pipes, because due to crown matching the disposal point is going too deep

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