The river Yamuna, a major tributary of the Ganges, comes down to Delhi from the Himalayas. Its been coming down for over 50 million years , running its banks during the monsoon , swollen with water and depositing sands on its floodplain. This sandy layer on top is now about 40 meters deep and 100sq km in area - that's a lot.

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Status

The official demarcation of the Delhi Yamuna floodplains, a protected area for water recharge, can be found 

1)   In The Master Plan MPD 2001
2)    With the The Central Ground Water Board
3)    With  the The Geological Survey of India

We have marked the area of the floodplains in the NCR from Palla in the North to past Okhla in the South. The floodplains are bounded in the south by the Haryana state boundary and to the east and north by the U.P state boundary as can be seen from the basic first level map.
No detailed ground level map of the Delhi Yamuna floodplains is available from the authorities . This a great  and very valuable resource of water for the citizens of Delhi and in danger of being lost. It has been violated by persistent building pressure from encroachments. Hence  such a map is badly needed to stop encroachments and for its protection by all citizens. For the first time the citizens can get such a map online.