Results
| Country: | Brasil
| | Station: | Barra Sao Manoel | | River: | Tapajos | | Area: | 332163 km2 | | Lat: | -7.32 | | Lon: | -58.08 | | Source: | ANEEL | | PointID: | 38 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1975 | | Ending Year: | 1994 | | Total Years: | 20 | | Total Usable Years: | 16 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1975 | 6170 | 8212 | 8795 | 7988 | 6216 | 3189 | 2106 | 1573 | 1318 | 1637 | 3908 | 6070 | 4765.17 |
| 1976 | 7949 | 11354 | 13569 | 12800 | 9720 | 6278 | 3976 | 3073 | 2900 | 3553 | 4742 | 7175 | 7257.42 |
| 1977 | 10825 | 12966 | 13189 | 12113 | 10077 | 7611 | 4597 | 3283 | 3127 | 4195 | 5875 | 8908 | 8063.83 |
| 1978 | 16800 | 13819 | 18888 | 15550 | 12346 | 8345 | 5340 | 4006 | 3487 | 4099 | 5323 | 8591 | 9716.17 |
| 1979 | 13086 | 18016 | 20291 | 15581 | 10066 | 6528 | 4584 | 3627 | 3955 | 3814 | 4923 | 5451 | 9160.17 |
| 1980 | 9885 | 15700 | 19291 | 14315 | 8982 | 5715 | 4325 | 3476 | 3349 | 3873 | 4434 | 7020 | 8363.75 |
| 1981 | 11760 | 13804 | 13489 | 13850 | 9147 | 5479 | 3935 | 3331 | 3194 | 3423 | 5767 | 7832 | 7917.58 |
| 1982 | 12496 | 16410 | 16769 | 14863 | 12065 | 6705 | 4655 | 3876 | 4022 | 4179 | 4353 | 5103 | 8791.33 |
| 1983 | 11583 | 16893 | 16314 | 13748 | 9038 | 5843 | 4097 | 3280 | 3002 | 3314 | 4906 | 7156 | 8264.5 |
| 1984 | 8831 | 11075 | 13638 | 14929 | 11165 | 6430 | 4089 | 3208 | 3238 | 3421 | 4666 | 6534 | 7602 |
| 1985 | 11631 | 15645 | 15215 | 15880 | 12606 | 6401 | 4526 | 3476 | 3212 | 3741 | 5145 | 6599 | 8673.08 |
| 1986 | 13020 | 15456 | 14781 | 13578 | 9938 | 6185 | 4218 | 3498 | 3540 | 4412 | 5063 | 6600 | 8357.42 |
| 1987 | 9683 | 12195 | 13555 | 11915 | 8058 | 5123 | 3552 | 3032 | 2909 | 2918 | 4062 | 7178 | 7015 |
| 1988 | 10961 | 12961 | 17092 | 15738 | 11372 | 6974 | 4465 | 3408 | 3078 | 3329 | 4564 | 8258 | 8516.67 |
| 1989 | 12562 | 16237 | 17016 | 16222 | 12848 | 7170 | 5323 | 4132 | 3575 | 3691 | 5543 | 9220 | 9461.58 |
| 1990 | 13908 | 14041 | 17298 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1991 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1992 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1993 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | 3016 | 2984 | 3120 | 3686 | 5903 | -9999 |
| 1994 | 12487 | 13492 | 15471 | 13740 | 9853 | 6114 | 4480 | 3318 | 3036 | 3369 | 4073 | 8112 | 8128.75 |
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| Avg | 11390.4 | 14016.2 | 15568.3 | 13925.6 | 10218.6 | 6255.63 | 4266.75 | 3330.18 | 3172.12 | 3534.59 | 4766.65 | 7159.41 | 8128.4 |
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| Std Dev | 2382.46 |
2398.74 |
2711.44 |
1997.45 |
1732.76 |
1108.51 |
716.78 |
538.17 |
565.92 |
618.18 |
624.62 |
1159.89 |
1118.36 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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