| Year | 1984 | 2000 | 2010 |
| Total population | 251390 | 956871 | 1356701 |
| coverage | 49% | 82% | 87% |
| Per capita consumption | 169 | 130 | 132 |
| Water requirement (l/s) | 483 | 2267 | 3454 |
| Available supply (l/s) | 420 | 540 | 540 |
| Additional raw water (l/s) | 63 | 1727 | 2914 |