Scientific Investigations Report 2007–5038
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5038
Table 7. Mean monthly precipitation at active weather stations and calculated Eastern Snake Plain Aquifer Model recharge (thick-soil parameters).
[Western Regional Climate Center (2006a, 2006b). Mean precipitation values are through December 31, 2005. Exp. Stat., experiment station; WSO, Weather Service Office; in., inch; ratio, recharge to precipitation ratio]
| Station name | |||||||
|---|---|---|---|---|---|---|---|
| Bayview Model Basin | Coeur D’Alene 1E | Newport | Priest River Exp. Stat. | Sandpoint Exp. Stat. | Spokane WSO Airport | ||
| January | Precipitation (in.) | 2.8 | 3.4 | 3.2 | 4.0 | 4.1 | 2.0 |
| Recharge (in.) | .09 | .13 | .11 | .18 | .19 | .04 | |
| Ratio (percent) | 3 | 4 | 4 | 5 | 5 | 2 | |
| February | Precipitation (in.) | 2.1 | 2.5 | 2.4 | 3.0 | 3.1 | 1.5 |
| Recharge (in.) | .05 | .07 | .06 | .01 | .11 | .03 | |
| Ratio (percent) | 2 | 3 | 3 | 3 | 4 | 2 | |
| March | Precipitation (in.) | 2.0 | 2.3 | 2.3 | 2.7 | 2.8 | 1.4 |
| Recharge (in.) | .05 | .06 | .06 | .08 | .09 | .02 | |
| Ratio (percent) | 2 | 3 | 3 | 3 | 3 | 2 | |
| April | Precipitation (in.) | 1.8 | 1.7 | 1.8 | 2.1 | 2.1 | 1.1 |
| Recharge (in.) | .03 | .03 | .04 | .05 | .05 | .01 | |
| Ratio (percent) | 2 | 2 | 2 | 2 | 2 | 1 | |
| May | Precipitation (in.) | 2.1 | 2.0 | 2.1 | 2.3 | 2.3 | 1.4 |
| Recharge (in.) | .05 | .05 | .05 | .06 | .06 | .02 | |
| Ratio (percent) | 2 | 2 | 2 | 3 | 3 | 2 | |
| June | Precipitation (in.) | 1.8 | 1.8 | 1.9 | 2.3 | 2.3 | 1.2 |
| Recharge (in.) | .04 | .04 | .04 | .06 | .06 | .02 | |
| Ratio (percent) | 2 | 2 | 2 | 3 | 3 | 1 | |
| July | Precipitation (in.) | 1.0 | .7 | .9 | 1.0 | 1.0 | .55 |
| Recharge (in.) | .01 | .01 | .09 | .01 | .01 | .00 | |
| Ratio (percent) | 1 | 1 | 1 | 1 | 1 | 1 | |
| August | Precipitation (in.) | 1.1 | .9 | 1.0 | 1.2 | 1.2 | .63 |
| Recharge (in.) | .01 | .01 | .01 | .02 | .02 | .00 | |
| Ratio (percent) | 1 | 1 | 1 | 1 | 1 | 1 | |
| September | Precipitation (in.) | 1.2 | 1.3 | 1.4 | 1.6 | 1.7 | .80 |
| Recharge (in.) | .02 | .02 | .02 | .03 | .03 | .01 | |
| Ratio (percent) | 1 | 1 | 2 | 2 | 2 | 1 | |
| October | Precipitation (in.) | 2.1 | 2.0 | 2.2 | 2.6 | 2.6 | 1.2 |
| Recharge (in.) | .05 | .04 | .05 | .07 | .08 | .02 | |
| Ratio (percent) | 2 | 2 | 2 | 3 | 3 | 1 | |
| November | Precipitation (in.) | 2.9 | 3.1 | 3.5 | 4.0 | 4.3 | 2.1 |
| Recharge (in.) | .10 | .11 | .14 | .18 | .21 | .05 | |
| Ratio (percent) | 3 | 4 | 4 | 5 | 5 | 2 | |
| December | Precipitation (in.) | 3.2 | 3.6 | 3.7 | 4.4 | 4.6 | 2.2 |
| Recharge (in.) | .11 | .15 | .16 | .22 | .24 | .05 | |
| Ratio (percent) | 4 | 4 | 4 | 5 | 5 | 2 | |
| Annual | Precipitation (in.) | 24 | 25 | 26 | 31 | 32 | 16 |
| Recharge (in.) | .61 | .71 | .75 | 1.1 | 1.13 | .28 | |
| Ratio (percent) | 3 | 3 | 3 | 3 | 4 | 2 | |
U.S.
Department of the Interior | U.S. Geological
Survey
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