Read a fine article (in Maharashtra Times or Loksatta) this weekend about how the Mithi river has undergone drastic changes in just 30 years. The writer talks about watchposts erected in the river (yes, you had to use a boat to get there), for avid ornithologists.
Also the writer points out though there is a whole activity on to clear the path of the river from encroachments, the damage cannot be totally reversed. The Bandra Kurla Complex and the MMRDA office (from where directives are issued for Mithi cleanup), themselves are built right in the river bed.
Talk of greater irony!
I wish I could link to the article and the fabulous photos accompanying it