Results
| Country: | Brazil
| | Station: | PortoFormoso | | River: | Parnaiba | | Area: | 282000 km2 | | Lat: | -3.43 | | Lon: | -42.4 | | Source: | | | PointID: | 1146 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1976 | | Ending Year: | 1981 | | Total Years: | 6 | | Total Usable Years: | 6 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1976 | 754 | 1468 | 1262 | 1316 | 451 | 337 | 314 | 324 | 325 | 564 | 654 | 680 | 704.08 |
| 1977 | 778 | 1267 | 1313 | 1884 | 1919 | 605 | 418 | 356 | 350 | 431 | 451 | 539 | 859.25 |
| 1978 | 1378 | 957 | 2149 | 1477 | 1786 | 599 | 461 | 344 | 343 | 330 | 548 | 768 | 928.33 |
| 1979 | 1100 | 2528 | 1794 | 886 | 934 | 470 | 355 | 387 | 439 | 375 | 725 | 560 | 879.42 |
| 1980 | 1400 | 2519 | 3107 | 827 | 450 | 362 | 355 | 294 | 338 | 537 | 717 | 775 | 973.42 |
| 1981 | 841 | 786 | 1202 | 1943 | 629 | 425 | 349 | 311 | 273 | 451 | 726 | 621 | 713.08 |
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| Avg | 1041.83 | 1587.5 | 1804.5 | 1388.83 | 1028.17 | 466.33 | 375.33 | 336 | 344.67 | 448 | 636.83 | 657.17 | 842.93 |
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| Std Dev | 270.02 |
696.32 |
672.58 |
434.72 |
606.01 |
105.01 |
49.06 |
30.55 |
49.16 |
82.59 |
103.98 |
92.56 |
101.7 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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