Thanks Rakesh for your comments. Actually it's not a treatment plant. it is an open stormwater drain which is receiving domestic sewage from different residential areas adjacent to the main drain. It is not a proper channelized concrete structure. The width and depth are not constant. This is the reason mass balance is difficult to calculate.

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Thanks Rakesh for your comments. Actually it's not a treatment plant. it is an open stormwater drain which is receiving domestic sewage from different residential areas adjacent to the main drain. It is not a proper channelized concrete structure. The width and depth are not constant. This is the reason mass balance is difficult to calculate.