Scientific Investigations Report 2009–5015
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2009–5015
Table 2. Range of values of basin characteristics used to estimate the low-flow statistic, 7Q2 , for unregulated streams in regions 1–8, Idaho.
[Locations of regions are shown in figure 1. Equation variables: A, drainage area, in square miles; E, mean elevation, in feet; P, mean annual precipitation, in inches. Abbreviations: 7Q2, 7-day 2-year low flow, in cubic feet per second; NA, not applicable—variable not used in regression equation]
| Equation variables | |||
|---|---|---|---|
| A | E | P | |
| Region 1 | |||
| Maximum | 1,011.0 | NA | NA |
| Minimum | 12.5 | NA | NA |
| Region 2 | |||
| Maximum | 2,442.5 | NA | 69.4 |
| Minimum | 3.0 | NA | 24.8 |
| Region 3 | |||
| Maximum | 674.9 | NA | NA |
| Minimum | 17.6 | NA | NA |
| Region 4 | |||
| Maximum | 5,507.9 | NA | 65.6 |
| Minimum | 4.0 | NA | 15.9 |
| Region 5 | |||
| Maximum | 12,228.0 | NA | NA |
| Minimum | 19.3 | NA | NA |
| Region 6 | |||
| Maximum | 6,236.7 | NA | 42.3 |
| Minimum | 6.4 | NA | 15.3 |
| Region 7 | |||
| Maximum | 535.3 | 8,463.4 | NA |
| Minimum | 7.4 | 2,984.4 | NA |
| Region 8 | |||
| Maximum | 874.8 | NA | 56.0 |
| Minimum | 6.6 | NA | 14.2 |
U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubs.usgs.gov/sir/2009/5015
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