The Calcutta Municipal Corporation (CMC) has taken up a project to lay a mastic asphalt coat on all motorable roads in the city proper before Puja.
According to civic engineers, laying bitumen on the surface is the cheapest way to metal a road. Bituminous roads are good in dry weather. A layer of mastic asphalt prevents water from seeping to the bitumen.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-proof-coat-city-roads
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/telegraph-kolkata
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waterlogging
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/habitat-and-urbanisation
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/municipal-corporations
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/calcutta-d