Scientific Investigations Report 2006–5230
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5230
Table 4. Calculated and estimated 80-, 50-, and 20-percent monthly exceedance discharge values for Challis Creek near Challis (13299000), upper Salmon River Basin, Idaho.
[Values presented in cubic feet per second. Long term: Based on data for water years 1944–63]
| July | August | September | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | |||
| Long term | 48.1 | 60.7 | 82.8 | 29.6 | 38.5 | 48.4 | 21.2 | 25.7 | 32.0 | ||
| Regional regression equations | |||||||||||
| Upper confidence limit | 61.4 | 88.2 | 129 | 34.5 | 52.6 | 57.4 | 29.5 | 41.7 | 42.7 | ||
| Estimate | 27.7 | 48.4 | 82.4 | 16.4 | 24.1 | 35.9 | 14.5 | 19.9 | 27.6 | ||
| Lower confidence limit | 12.5 | 26.2 | 52.6 | 7.80 | 11.1 | 22.5 | 7.10 | 9.50 | 17.8 | ||
U.S.
Department of the Interior | U.S. Geological
Survey
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