Eighteen nullahs built seven centuries ago can help prevent water logging on city roads and preserve water for summers. Conservationists said that if these Tughlaq-era nullahs are used, roads won't
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/old-nullahs-can-save-water-going-waste
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dams
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/irrigation