| Sampling station | Season | Data period | Mann-Kendall’s tau | S | Var (S) | p-value (Two-tailed) | alpha | Sen’s slope | Sen’s Intercept | Significant Trend | Trend Tendency | ||||
| Slope | Lower bound (95%) | Upper bound (95%) | Intercept | Lower bound (95%) | Upper bound (95%) | ||||||||||
| Intake | Wet | 2004-2018 | 0.201 | 801 | 293 | 0.139 | 0.05 | 0.027 | 0.007 | 0.046 | −863 | −1249 | −459 | No | Increasing |
| Dry | 0.238 | 948 | 240 | 0.053 | 0.05 | 0.041 | 0.016 | 0.061 | −1309 | −1708 | −808 | No | Increasing | ||
| Offtake | Wet | 2004-2018 | −0.388 | −1549 | 580 | 0.042 | 0.05 | −0.009 | −0.012 | −0.006 | 383 | 328 | 457 | Yes | Decreasing |
| Dry | −0.496 | −1939 | 1056 | 0.058 | 0.05 | −0.007 | −0.008 | −0.005 | 291 | 257 | 322 | No | Decreasing | ||