Results
| Country: | U.S.A.
| | Station: | SIOUX FALLS SD | | River: | BIG SIOUX R | | Area: | 13459.43 | | Lat: | 43.5 | | Lon: | -96.75 | | Source: | USGS | | PointID: | 6482000 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1943 | | Ending Year: | 1960 | | Total Years: | 18 | | Total Usable Years: | 17 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1943 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | 4.33 | 2.21 | 3.08 | 2.46 | -9999 |
| 1944 | 1.6 | 18.03 | 26.25 | 16.73 | 37.79 | 21.76 | 17.07 | 12.31 | 6.97 | 3.7 | 3.59 | 3.09 | 14.07 |
| 1945 | 0.93 | 13.05 | 28.57 | 12.1 | 14.34 | 51.23 | 20.66 | 6.26 | 2.66 | 1.79 | 1.62 | 0.84 | 12.84 |
| 1946 | 0.48 | 3.96 | 45.93 | 17.46 | 8.21 | 8.07 | 14 | 4.32 | 6.16 | 10.84 | 9.43 | 4.49 | 11.11 |
| 1947 | 2.35 | 4.26 | 5.13 | 59.28 | 32.38 | 39.57 | 13.25 | 3.83 | 2.14 | 2.1 | 2.46 | 1.58 | 14.03 |
| 1948 | 0.57 | 8.85 | 60.21 | 38.5 | 22.54 | 12.13 | 24.29 | 14.13 | 8.47 | 5.07 | 4.03 | 2.1 | 16.74 |
| 1949 | 0.84 | 1.63 | 22.65 | 33.01 | 10.38 | 6.59 | 2.6 | 1.78 | 1.15 | 0.98 | 1.1 | 0.89 | 6.97 |
| 1950 | 0.18 | 0.18 | 8.2 | 24.39 | 17.97 | 7.1 | 2.23 | 1.19 | 1.81 | 4.68 | 1.72 | 0.69 | 5.86 |
| 1951 | 0.31 | 1.23 | 13.92 | 104.9 | 22.69 | 25.73 | 23.18 | 18.35 | 16.47 | 7.38 | 4.37 | 3.22 | 20.15 |
| 1952 | 2.06 | 5.96 | 19.65 | 173.86 | 39.98 | 27.37 | 21.62 | 7.4 | 3.6 | 1.76 | 1.27 | 0.89 | 25.45 |
| 1953 | 0.56 | 0.44 | 23.22 | 16.77 | 31.19 | 21.3 | 12.06 | 19.19 | 6.45 | 2.72 | 2.01 | 1.39 | 11.44 |
| 1954 | 0.56 | 5.53 | 34.89 | 17.14 | 13.89 | 15.27 | 7.18 | 3.94 | 2.8 | 1.81 | 1.64 | 1.09 | 8.81 |
| 1955 | 0.64 | 0.37 | 12.29 | 6.58 | 2.72 | 1.43 | 0.67 | 0.21 | 0.05 | 0.06 | 0.16 | 0.1 | 2.11 |
| 1956 | 0.09 | 0.09 | 0.78 | 3.61 | 1.58 | 2.55 | 3.02 | 6.05 | 1.37 | 0.7 | 1.04 | 0.53 | 1.78 |
| 1957 | 0.2 | 0.15 | 11.14 | 5.9 | 7.78 | 76.96 | 20.4 | 3.41 | 2.2 | 1.75 | 2.04 | 1.71 | 11.14 |
| 1958 | 0.96 | 1.3 | 4 | 8.4 | 4.46 | 2.65 | 1.08 | 0.2 | 0.09 | 0.07 | 0.17 | 0.16 | 1.96 |
| 1959 | 0.07 | 0.06 | 3.53 | 1.27 | 3.67 | 1.05 | 0.12 | 0.85 | 0.35 | 0.21 | 0.28 | 0.34 | 0.98 |
| 1960 | 0.25 | 0.21 | 20.1 | 64.78 | 10.74 | 6.06 | 2.44 | 2.21 | 2.96 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 0.74 | 3.84 | 20.03 | 35.57 | 16.61 | 19.22 | 10.93 | 6.21 | 3.89 | 2.81 | 2.35 | 1.5 | 10.34 |
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| Std Dev | 0.65 |
5.02 |
15.48 |
43.43 |
12.12 |
19.94 |
8.72 |
5.95 |
3.87 |
2.76 |
2.16 |
1.18 |
6.77 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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