COMPARATIVE WATER QUALITY ANALYSIS OF THE CIRCULAR CANAL AND THE TOLLY’S NALA IN KOLKATA MEGACITYCHANDANI BHATTACHARJEEAbstract The city of Kolkata has a unique network of canals which have sustained the geomorphics of the city for centuries. Presently, there has been human and natural degeneration on this network. The canal system which contained the city literally has been overburdened by sewage disposals and encroachments. The study of two canals, the Circular canal and the TollyÂ’s Nala has been made keeping in mind these two polluting parameters. The purpose of this paper has been to highlight the water quality of the canals and determine if at all there is any pattern to the pollution in the canals. The location of the megacity and the future sustenance of the same would depend on how healthy the canals are as they have a huge flushing effect on the silt of the lower Bengal region which is predominantly the riverine area of Hugli. Planners and developers need assess the importance of the twin canals rather that diverting, blocking and chocking them for meager short term gains.
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