Scientific Investigations Report 2006–5230
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5230
Table 5. Calculated and estimated 80-, 50-, and 20-percent monthly exceedance discharge values for Challis Creek below Jeffs Creek, near Challis (13299200), upper Salmon River Basin, Idaho.
[Values presented in cubic feet per second. Long term: Based on data for water years 1963–70]
| July | August | September | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | Q.80 | Q.50 | Q.20 | |||
| Long term | 47.0 | 67.6 | 102 | 37.1 | 46.0 | 54.7 | 22.4 | 27.1 | 38.2 | ||
| Regional regression equations | |||||||||||
| Upper confidence limit | 59.4 | 85.6 | 127 | 33.6 | 51.2 | 56.8 | 29.1 | 41.3 | 42.9 | ||
| Estimate | 26.8 | 46.7 | 81.1 | 16.0 | 23.5 | 35.5 | 14.3 | 19.7 | 27.7 | ||
| Lower confidence limit | 12.1 | 25.5 | 51.8 | 7.60 | 10.8 | 22.2 | 7.00 | 9.40 | 17.9 | ||
U.S.
Department of the Interior | U.S. Geological
Survey
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