| Year | Rainfall (mm) | Change in groundwater recharge | ||
| Period | Mm | % | ||
| 1990 | 171 | 1990-1998 | −41.05 | −23.96 |
| 1998 | 130 | 1998-2016 | +27.88 | +21.41 |
| 2016 | 158 | 1990- 2016 | −13.16 | −8.32 |