Muktha River bed via Metro line laying is a good idea
It has strengthen the River bed and lcost of land are also less.Moreover in the road alignment so many trees have to be cut.and execution also tedious in road sector with diversion during execution.
Moreover ,In Chennai MRTS lines are mostly executed on the free land along the Bunkingam canal and lesser part along Adayar River bed.MRTS executed successfully and completed in time because of lesser land acquired required for this project.
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more... Similarly Mula - Muktha River bed alignment also executed early without any hurdles and traffic blockages are also mostly nil in this route.