Scientific Investigations Report 2006–5230

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5230

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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

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