Results
| Country: | South_Africa
| | Station: | Engelbrechtsdrift | | River: | Vaal | | Area: | 38564 km2 | | Lat: | -26.82 | | Lon: | 28.06 | | Source: | RivDIS | | PointID: | 1518 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1964 | | Ending Year: | 1986 | | Total Years: | 23 | | Total Usable Years: | 21 | |
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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 | 33.4 | 40.8 | 148 | -9999 |
| 1965 | 146 | 86.1 | 47.8 | 29.3 | 38.8 | 31.8 | 36.9 | 37.8 | 54.7 | 52.5 | 51.5 | 46.7 | 54.99 |
| 1966 | 36.3 | 5.27 | 33.2 | 23.7 | 24.8 | 22 | 29.9 | 29.2 | 28.6 | 17.6 | 14.7 | 10.4 | 22.97 |
| 1967 | 3.26 | 363 | 91.8 | 91.5 | 23.8 | 7.65 | 11.5 | 16.4 | 28 | 41.4 | 25.1 | 29.8 | 61.1 |
| 1968 | 41.7 | 56.2 | 9.14 | 8.26 | 9.35 | 12.1 | 28.6 | 35.7 | 39.9 | 40.7 | 26 | 17.4 | 27.09 |
| 1969 | 46.5 | 42.6 | 10.5 | 6.14 | 8.58 | 7.69 | 7.6 | 26.5 | 29.9 | 31.7 | 10.8 | 8.68 | 19.77 |
| 1970 | 30.6 | 23.6 | 34.1 | 30.6 | 16.2 | 17 | 15.8 | 28.9 | 41.7 | 29.6 | 15.3 | 26.5 | 25.83 |
| 1971 | 7.09 | 8.99 | 8.99 | 7.45 | 7.9 | 9.44 | 8 | 11.7 | 12.6 | 15.3 | 9.47 | 7.25 | 9.51 |
| 1972 | 9.31 | 19.3 | 110 | 20.1 | 7.33 | 8.1 | 10.4 | 10.6 | 16.6 | 17.2 | 12.8 | 16.7 | 21.54 |
| 1973 | 18.3 | 14.5 | 17.4 | 7.59 | 10.8 | 12.5 | 11.8 | 13.3 | 19.4 | 30.3 | 18 | 5.99 | 14.99 |
| 1974 | 97.7 | 245 | 10.8 | 25.8 | 8.71 | 8.7 | 9.68 | 13.3 | 16.7 | 19.1 | 7.35 | 293 | 62.99 |
| 1975 | 310 | 1110 | 138 | 47.4 | 15.4 | 11.3 | 9.1 | 12.7 | 18.2 | 20.6 | 89.5 | 369 | 179.27 |
| 1976 | 331 | 348 | 208 | 68.1 | 115 | 9.5 | 10.9 | 11.4 | 19.7 | 55.9 | 86.1 | 65.6 | 110.77 |
| 1977 | 68.6 | 417 | 31.3 | 18.2 | 11.9 | 11.1 | 10.5 | 15.8 | 16.7 | 15.4 | 14.1 | 13.8 | 53.7 |
| 1978 | 378 | 83.4 | 85.4 | 64.8 | 11.4 | 7.65 | 6.85 | 11.7 | 9.58 | 11.4 | 11.9 | 13.6 | 57.97 |
| 1979 | 13.8 | 11.1 | 15.5 | 13.8 | -9999 | 10.6 | 9.63 | 8.78 | 9.04 | 12.2 | 2.47 | -9999 | -9999 |
| 1980 | 0.5 | 102 | 23.5 | 8.9 | 9.9 | 10.3 | 9.39 | -9999 | 11.7 | 16.5 | 19.4 | 3.82 | -9999 |
| 1981 | 8.03 | 0.59 | 52.5 | 9.58 | 8.51 | 10.9 | 11.7 | 12.1 | 12.1 | 11.7 | 20.9 | 6.39 | 13.75 |
| 1982 | 6.45 | 14.9 | 15.8 | 14.9 | 15.2 | 14 | 12.5 | 17.6 | 22.8 | 21.7 | 20.5 | 20.6 | 16.41 |
| 1983 | 18.4 | 19.5 | 21.2 | 17.2 | 14.4 | 8.81 | 12.5 | 9.1 | 21.2 | 11.5 | 5.39 | 1.33 | 13.38 |
| 1984 | 0.37 | 11.6 | 22.9 | 20.1 | 6.83 | 2 | 16.4 | 29.3 | 34 | 32.6 | 15.1 | 10.7 | 16.83 |
| 1985 | 13 | 9.49 | 2.82 | 7.78 | 8.19 | 20.4 | 23.2 | 31.3 | 37.2 | 33.5 | 8.09 | 4.92 | 16.66 |
| 1986 | 3.01 | 2.86 | 17.6 | 7.07 | 8.01 | 17.4 | 19.6 | 28.6 | 29.2 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 72.18 | 136.14 | 45.83 | 24.92 | 18.14 | 12.32 | 14.66 | 19.61 | 24.07 | 25.99 | 23.88 | 53.34 | 42.08 |
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| Std Dev | 112.2 |
247.08 |
50.11 |
22.53 |
22.91 |
6.15 |
7.9 |
9.36 |
11.64 |
12.87 |
22.97 |
96.14 |
41.06 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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