| S.No | Sub Basin List | Area | Rivers | District Covered | Reservoirs under WRD Control | No. of Tanks under WRD |
|---|---|---|---|---|---|---|
| Total Nambiyar basin Area 2000.485 sq.km | ||||||
| 1 | Karumeniyar | 852.406 sq.km | Karumeniyar | Tuticorin | – | 138 |
| 2 | Nambiyar | 677.342 sq.km | Kallankal Odai Nambiyar, Thamaraiyar | Tirunelveli | Kodumudiyar Nambiyar | 119 |
| 3 | Hanumanadhi | 470.737 sq.km | Hanumanadhi | Tirunelveli, Tuticorin | – | 98 |
