DDA bans concrete construction on Yamuna banks Some more good news: Away from the Yamuna riverfront, renovation work under way at the ancient Humayun's Tomb in Delhi on Wednesday. In a development that has come as a big relief to environmentalists and conservationists in the Capital, the Delhi Development Authority has decided not to allow any new proposal for concrete construction on the Yamuna banks in view of the upcoming 2010 Commonwealth Games in the city. The decision was taken on Wednesday at a meeting of the DDA chaired by Lieutenant-Governor Tejendra Khanna where a detailed discussion on the draft Zonal Plan for Zone