There are mainly three major effects of sediment deposition in sewers:
(i) The deposited sediment may cause initiate small blockage of flow. Later when larger solid builds up it may result in total blockage of sewers.
(ii) The deposited sewer restricts flows leading to the drop in hydraulic capacity.
(iii) The deposited sediment serves as a point of pollutant storage or generator. The pollutants are stored temporarily and be discharged in high flow conditions. Moreover, biomedical change in sediment deposition releases gases which are corrosive to sewers.
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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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