Results
| Country: | South_Africa
| | Station: | Vioolsdrif | | River: | Orange | | Area: | 850530 km2 | | Lat: | -28.71 | | Lon: | 17.51 | | Source: | RivDIS | | PointID: | 1459 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1964 | | Ending Year: | 1986 | | Total Years: | 23 | | Total Usable Years: | 20 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1964 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | 182 | 340 | 124 | -9999 |
| 1965 | 277 | 153 | 70.7 | 26.9 | 116 | 23.2 | 41.4 | 69.8 | 68.7 | 41.9 | 60 | 60.3 | 84.08 |
| 1966 | 271 | 927 | 135 | 18.3 | 19.2 | 13.5 | 7.05 | 1.93 | -9999 | 0.23 | 0 | 24.1 | -9999 |
| 1967 | 162 | 2105 | 684 | 1055 | 487 | 433 | 176 | 52.1 | 36.6 | 21.1 | 51.5 | 126 | 449.11 |
| 1968 | 30.2 | 3.87 | 15.7 | 195 | 223 | 136 | 35.3 | 29.6 | 4.62 | 14.7 | 2.12 | 119 | 67.43 |
| 1969 | 33.6 | 0.34 | 409 | 542 | 111 | 84 | 35.8 | 8.51 | 0.4 | 0 | 194 | 15.9 | 119.55 |
| 1970 | 31.8 | 104 | 37 | 9.94 | 0 | 0 | 0 | 0 | 0 | 6.29 | 110 | 66.1 | 30.43 |
| 1971 | 86.7 | 102 | 35.8 | 57.9 | 33.6 | 26.9 | -9999 | 18.5 | 56 | 57.7 | 53.6 | 49.6 | -9999 |
| 1972 | 123 | 100 | 742 | 726 | 205 | 279 | 209 | 117 | 96.5 | 91.2 | 188 | 143 | 251.64 |
| 1973 | 37.4 | 33.3 | 60 | 72.7 | 49 | 53.3 | 60.7 | 44.1 | 40 | -9999 | 29.6 | 53.1 | -9999 |
| 1974 | 113 | 754 | -9999 | -9999 | -9999 | 318 | 192 | 342 | 330 | 209 | 163 | 276 | -9999 |
| 1975 | 395 | 635 | -9999 | 401 | -9999 | 170 | 138 | 133 | 90.1 | 154 | 175 | 438 | -9999 |
| 1976 | 1001 | -9999 | 274 | -9999 | -9999 | 478 | 252 | 160 | 74.6 | 186 | 430 | 451 | -9999 |
| 1977 | 242 | 589 | 404 | 279 | 202 | 101 | 111 | 168 | 134 | 109 | 223 | -9999 | -9999 |
| 1978 | 93 | 424 | 288 | 292 | 381 | 108 | 157 | 208 | 202 | 204 | 195 | 173 | 227.08 |
| 1979 | 214 | 195 | 195 | 61.4 | 90.7 | 71.8 | 71.4 | 67.1 | 37 | 55.8 | 68.2 | 55.3 | 98.56 |
| 1980 | 97 | 108 | 128 | 88.7 | 50 | 105 | 109 | 106 | 57.3 | 74.4 | 58.7 | 64.7 | 87.23 |
| 1981 | 58.8 | 131 | 175 | 142 | -9999 | 167 | 158 | -9999 | 150 | 149 | 131 | 120 | -9999 |
| 1982 | -9999 | 128 | 144 | 140 | 137 | 49 | 96.2 | -9999 | 31.9 | 44.4 | 22.2 | 50 | -9999 |
| 1983 | 33.7 | 32 | 49.5 | 46.3 | 20.6 | 48 | -9999 | 38 | 18.7 | 79.1 | -9999 | 87.4 | -9999 |
| 1984 | 57 | 30.5 | 27.8 | 90.7 | 50.4 | -9999 | -9999 | 15.2 | 18.8 | 8.46 | 34.6 | 26.7 | -9999 |
| 1985 | 31.7 | 23.7 | 40.3 | 39.3 | 30.5 | 40.6 | 34.2 | -9999 | 22.6 | -9999 | 39.4 | 75 | -9999 |
| 1986 | 55.4 | 138 | 140 | 66.1 | 61.3 | 53.5 | 71.5 | 64.6 | 67.4 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 164.01 | 319.84 | 202.74 | 217.51 | 125.96 | 131.37 | 102.92 | 86.5 | 73.2 | 84.41 | 122.33 | 123.72 | 157.23 |
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| Std Dev | 211.99 |
478.14 |
205.52 |
267.12 |
128.26 |
132.09 |
70.79 |
84.51 |
76.49 |
70.48 |
110.15 |
119.12 |
123.94 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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