In compliance to the Hon’ble National Green Tribunal’s directives to curtail the depletion of ground water in Delhi and to stop the further extraction of groundwater for gardening purposes, DDA has focused on the use of treated wastewater for horticulture purposes using various modes such as - through Pipeline from centralized STPs of DJB/DDA, through tankers from DJB STPs & installation decentralized STPs/Wastewater Treatment Plants in parks.
The status is as under:
- Total No. of Parks: 688 (having an area of about 10816 Acres)
- Total Water Requirement: 34 MLD.
| Sr. No. | Mode of Irrigation | No. of Parks |
| 1 | STP Pipeline from Centralized STPs of DJB/DDA | 112 |
| 2 | Through decentralized STPs | 69 |
| 3 | ThroughTankers | 120 |
| 4 | New STP line Proposed DDA in Rohini DJB |
41 175 |
| 5 | Decentralized STPs (in progress) | 24 |
| 6 | Drainage/ Others means | 39 |
| 7 | No irrigation required/woodlands | 92 |