Results
| Country: | Brasil
| | Station: | Porto Uruacu | | River: | Maranhao | | Area: | 34146 km2 | | Lat: | -14.5 | | Lon: | -49 | | Source: | ANEEL | | PointID: | 97 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1977 | | Ending Year: | 1984 | | Total Years: | 8 | | Total Usable Years: | 7 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1977 | 395 | 190 | 212 | 259 | 121 | 96 | 87 | 75 | 82 | 114 | 109 | 635 | 197.92 |
| 1978 | 1343 | 2521 | -9999 | 1261 | 324 | 245 | 173 | 141 | 125 | 171 | 249 | 709 | -9999 |
| 1979 | 2980 | 3509 | 916 | 621 | 263 | 195 | 162 | 142 | 148 | 183 | 403 | 352 | 822.83 |
| 1980 | 1770 | -9999 | 1479 | 545 | 363 | 262 | 224 | 194 | 185 | 192 | 451 | 1158 | -9999 |
| 1981 | 1510 | 653 | 967 | 913 | 300 | 254 | 188 | 164 | 145 | 315 | 1168 | 806 | 615.25 |
| 1982 | 3207 | 1450 | 814 | 546 | 276 | 230 | 173 | 157 | 151 | 157 | 208 | 250 | 634.92 |
| 1983 | 882 | 2349 | 976 | 980 | 261 | 200 | 149 | 128 | 122 | 164 | 346 | 840 | 616.42 |
| 1984 | 774 | 399 | 447 | 538 | 191 | 140 | 124 | 109 | 118 | 179 | 167 | 295 | 290.08 |
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| Avg | 1607.63 | 1581.57 | 830.14 | 707.88 | 262.38 | 202.75 | 160 | 138.75 | 134.5 | 184.38 | 387.63 | 630.63 | 529.57 |
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| Std Dev | 951.27 |
1158.88 |
377.5 |
298.48 |
71.25 |
54.85 |
38.68 |
33.73 |
28.26 |
54.14 |
314.79 |
294.54 |
215.77 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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