Scientific Investigations Report 2007–5038
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5038
Table 6. Mean monthly precipitation at active weather stations and calculated Eastern Snake Plain Aquifer Model recharge (thin-soil parameters).
[Western Regional Climate Center (2006a, 2006b). Mean precipitation values are through December 31, 2005. Abbreviations: 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.) | .64 | .82 | .76 | 1.1 | 1.1 | .37 | |
| Ratio (percent) | 22 | 24 | 24 | 27 | 27 | 19 | |
| February | Precipitation (in.) | 2.1 | 2.5 | 2.4 | 3.0 | 3.1 | 1.5 |
| Recharge (in.) | .42 | .51 | .48 | .68 | .74 | .26 | |
| Ratio (percent) | 20 | 21 | 20 | 23 | 24 | 17 | |
| March | Precipitation (in.) | 2.0 | 2.3 | 2.3 | 2.7 | 2.8 | 1.4 |
| Recharge (in.) | .39 | .46 | .46 | .60 | .61 | .22 | |
| Ratio (percent) | 19 | 20 | 20 | 22 | 22 | 16 | |
| April | Precipitation (in.) | 1.8 | 1.7 | 1.8 | 2.1 | 2.1 | 1.1 |
| Recharge (in.) | .31 | .30 | .33 | .40 | .40 | .16 | |
| Ratio (percent) | 18 | 18 | 18 | 19 | 19 | 14 | |
| May | Precipitation (in.) | 2.1 | 2.0 | 2.1 | 2.3 | 2.3 | 1.4 |
| Recharge (in.) | .40 | .38 | .40 | .48 | .48 | .23 | |
| Ratio (percent) | 19 | 19 | 19 | 20 | 20 | 16 | |
| June | Precipitation (in.) | 1.8 | 1.8 | 1.9 | 2.3 | 2.3 | 1.2 |
| Recharge (in.) | .32 | .32 | .34 | .45 | .45 | .18 | |
| Ratio (percent) | 18 | 18 | 18 | 20 | 20 | 15 | |
| July | Precipitation (in.) | 1.0 | .7 | .9 | 1.0 | 1.0 | .55 |
| Recharge (in.) | .13 | .08 | .12 | .14 | .13 | .05 | |
| Ratio (percent) | 13 | 11 | 13 | 14 | 13 | 10 | |
| August | Precipitation (in) | 1.1 | .9 | 1.0 | 1.2 | 1.2 | .63 |
| Recharge (in) | .15 | .12 | .13 | .17 | .17 | .07 | |
| Ratio (percent) | 14 | 13 | 13 | 14 | 15 | 11 | |
| September | Precipitation (in.) | 1.2 | 1.3 | 1.4 | 1.6 | 1.7 | .80 |
| Recharge (in.) | .18 | .19 | .21 | .26 | .29 | .10 | |
| Ratio (percent) | 15 | 15 | 16 | 17 | 17 | 12 | |
| October | Precipitation (in.) | 2.1 | 2.0 | 2.2 | 2.6 | 2.6 | 1.2 |
| Recharge (in.) | .40 | .37 | .43 | .55 | .57 | .17 | |
| Ratio (percent) | 19 | 19 | 20 | 21 | 22 | 14 | |
| November | Precipitation (in.) | 2.9 | 3.1 | 3.5 | 4.0 | 4.3 | 2.1 |
| Recharge (in.) | .67 | .73 | .86 | 1.1 | 1.2 | .40 | |
| Ratio (percent) | 23 | 23 | 25 | 27 | 28 | 19 | |
| December | Precipitation (in.) | 3.2 | 3.6 | 3.7 | 4.4 | 4.6 | 2.2 |
| Recharge (in.) | .75 | .92 | .95 | 1.2 | 1.3 | .43 | |
| Ratio (percent) | 24 | 25 | 26 | 28 | 29 | 20 | |
| Annual | Precipitation (in.) | 24.1 | 25.2 | 26.2 | 31.1 | 32.0 | 16.1 |
| Recharge (in.) | 4.7 | 5.2 | 5.5 | 7.1 | 7.4 | 2.6 | |
| Ratio (percent) | 20 | 21 | 21 | 23 | 23 | 16 | |
U.S.
Department of the Interior | U.S. Geological
Survey
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