Neela Hauz is a natural depression and was used to receive the entire drainage from the surrounding forests and used to supply drinking water to South Delhi at one time. It was filled up with solid wastes leaving a small depression which used to receive untreated sewage from surrounding colonies. During the construction of the Aruna Asaf Ali Bridge across Neela Hauz, it was further filled up and degraded and made into a waste dump.

To restore the Lake to its original state, the Lake was desilted and the desilted material was used for landscaping around the Lake. The raw sewage and raw sewage + treated sewage that used to enter Neela Hauz and then into Sanjay Van and finally to river Yamuna now is purified by passing through constructed wetland system with zero energy.

Photo by @mystic_lens08