Results
| Country: | Brasil
| | Station: | Pedras Negras | | River: | Guapore | | Area: | 116731 km2 | | Lat: | -12.83 | | Lon: | -62.93 | | Source: | ANEEL | | PointID: | 23 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1981 | | Ending Year: | 1995 | | Total Years: | 15 | | Total Usable Years: | 14 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1981 | 1051 | 1570 | 1893 | 2021 | 1540 | 978 | 453 | 243 | 188 | 187 | 292 | 617 | 919.42 |
| 1982 | 1220 | 1482 | 1824 | 1910 | 1794 | 1339 | 832 | 407 | 312 | 328 | 425 | 675 | 1045.67 |
| 1983 | 879 | 1264 | 1460 | 1455 | 1305 | 1016 | 629 | 310 | 197 | 174 | 220 | 374 | 773.58 |
| 1984 | 944 | 1496 | 1679 | 1828 | 1644 | 1249 | 759 | 308 | 228 | 186 | 335 | 746 | 950.17 |
| 1985 | 1317 | 1659 | 1875 | 1893 | 1739 | 1358 | 844 | 394 | 259 | 232 | 314 | 429 | 1026.08 |
| 1986 | 746 | 1449 | 1858 | 1866 | 1654 | 1351 | 879 | 417 | 287 | 254 | 229 | 385 | 947.92 |
| 1987 | 619 | 1035 | 1245 | 1301 | 1111 | 677 | 334 | 199 | 151 | 146 | 222 | 538 | 631.5 |
| 1988 | 1023 | 1482 | 1981 | 2272 | 1986 | 1439 | 918 | 375 | 212 | 187 | 174 | 339 | 1032.33 |
| 1989 | 793 | 1225 | 1742 | 1744 | 1691 | 1421 | 927 | 472 | 298 | 258 | 305 | 552 | 952.33 |
| 1990 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | 380 | 574 | -9999 |
| 1991 | 952 | 1439 | 1789 | 1928 | 1904 | 1482 | 983 | 488 | 273 | 247 | 357 | 581 | 1035.25 |
| 1992 | 944 | 1185 | 1602 | 1703 | 1523 | 1125 | 627 | 311 | 275 | 291 | 333 | 730 | 887.42 |
| 1993 | 1190 | 1560 | 1725 | 1681 | 1409 | 965 | 479 | 266 | 206 | 177 | 208 | 413 | 856.58 |
| 1994 | 792 | 1383 | 1633 | 1490 | 1254 | 986 | 624 | 346 | 233 | 218 | 296 | -9999 | -9999 |
| 1995 | 857 | 1515 | 1800 | 1752 | 1546 | 1219 | 848 | 384 | 234 | 185 | 199 | 495 | 919.5 |
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| Avg | 951.93 | 1410.29 | 1721.86 | 1774.57 | 1578.57 | 1186.07 | 724 | 351.43 | 239.5 | 219.29 | 285.93 | 532 | 921.37 |
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| Std Dev | 188.08 |
166.64 |
185.16 |
238.74 |
239.03 |
226.14 |
193.95 |
80.87 |
44.78 |
49.41 |
71.64 |
127.4 |
112.8 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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