
| Rain fall (mm) | Original | Revised |
|---|---|---|
| Mean annual : | 1381.25 (1900-45) | 1038 |
| Maximum annual : | 1808.73 (1919) | 2518 |
| Minimum annual : | 940.31(1902) | 607 |
| Run-off (M.ha.m) | Original | Post construction |
| Average annual : | 6.17 (1926-46) | 3.36 (1958-92) |
| Max. annual : | 8.62 (1919) | 9.09 (1961) |
| Min. annual : | 2.54 (1902) | 1.14 (1979) |