E. Sreedharan, principal advisor to the Kochi Metro rail project said that the Delhi Metro Rail Corporation will collect river sand without endangering the hydraulic system of the rivers.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sand-mining-metro-will-be-eco-friendly%E2%80%99d
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-thiruvananthapuram
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerala
[4] http://admin.indiaenvironmentportal.org.in/thesaurus/sand-mining
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rail-transport
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment