Scientific Investigations Report 2007–5258
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5258
Table 5. Surface-water trend analyses for three streamflow-gaging stations, Wood River Valley, south-central Idaho.
[All p-values are derived from Kendall’s tau with the Sen slope estimator. Numbers in bold are greater than 90 percent statistically significant. Slopes with negative values represent declining trends and positive values show increasing trends]
| Annual trends | |||
|---|---|---|---|
| Gaging station | p-value | Slope | |
| Big Wood River at Hailey Total | 0.601 | 0.339 | |
| Big Wood River near Bellevue | .611 | -.936 | |
| Silver Creek at Sportsman Access | .018 | -1.627 | |
| Monthly trends | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gaging station | Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | |
| Big Wood River at Hailey Total | p-value | 0.123 | 0.183 | 0.006 | 0.845 | 0.864 | 0.626 | 0.626 | 0.237 | 0.194 | 0.268 | 0.219 | 0.663 |
| Slope | .216 | .175 | .538 | .180 | .444 | 2.000 | .704 | .543 | .431 | .311 | .253 | .079 | |
| Big Wood River near Bellevue | p-value | .006 | .095 | .908 | .773 | .941 | .337 | .494 | .458 | .615 | .221 | .223 | .014 |
| Slope | -.485 | -.364 | -.057 | .333 | .230 | 2.843 | .479 | .167 | .083 | -.293 | -.490 | -.700 | |
| Silver Creek at Sportsman Access | p-value | .002 | .051 | .308 | .010 | .773 | .197 | .010 | .014 | .007 | .001 | .003 | .007 |
| Slope | -1.167 | -1.332 | -.700 | -1.792 | -.200 | -.895 | -2.043 | -2.407 | -3.200 | -3.987 | -2.523 | -1.867 | |
| Low-flow trends | |||
|---|---|---|---|
| Gaging station | Period | p-value | Slope |
| Big Wood River at Hailey Total | 7-day | 0.117 | 0.001 |
| 30-day | .097 | .001 | |
| Big Wood River near Bellevue | 7-day | .084 | -.263 |
| 30-day | .076 | -.319 | |
| Silver Creek at Sportsman Access | 7-day | .074 | -.875 |
| 30-day | .101 | -.897 | |
| BFI annual trends | ||
|---|---|---|
| Gaging station | p-value | Slope |
| Big Wood River at Hailey Total | 0.200 | 0.001 |
| Big Wood River near Bellevue | .905 | .000 |
| Silver Creek at Sportsman Access | .184 | -.170 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5258
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