Scientific Investigations Report 2007–5038
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5038
Table 8. Mean monthly precipitation at active weather stations and calculated Eastern Snake Plain Aquifer Model recharge (lava-rock 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.) | 1.5 | 1.8 | 1.7 | 2.2 | 2.3 | .95 | |
| Ratio (percent) | 52 | 53 | 53 | 55 | 56 | 48 | |
| February | Precipitation (in.) | 2.1 | 2.5 | 2.4 | 3.0 | 3.1 | 1.5 |
| Recharge (in.) | 1.0 | 1.2 | 1.2 | 1.5 | 1.7 | .70 | |
| Ratio (percent) | 49 | 50 | 50 | 52 | 53 | 46 | |
| March | Precipitation (in.) | 2.0 | 2.3 | 2.3 | 2.7 | 2.8 | 1.4 |
| Recharge (in.) | .99 | 1.13 | 1.13 | 1.39 | 1.42 | .62 | |
| Ratio (percent) | 48 | 49 | 49 | 51 | 51 | 45 | |
| April | Precipitation (in.) | 1.8 | 1.7 | 1.8 | 2.1 | 2.1 | 1.1 |
| Recharge (in.) | .82 | .81 | .86 | 1.02 | 1.01 | .48 | |
| Ratio (percent) | 47 | 47 | 47 | 49 | 49 | 43 | |
| May | Precipitation (in.) | 2.1 | 2.0 | 2.1 | 2.3 | 2.3 | 1.4 |
| Recharge (in.) | 1.0 | .97 | 1.0 | 1.2 | 1.2 | .64 | |
| Ratio (percent) | 49 | 48 | 49 | 50 | 50 | 45 | |
| June | Precipitation (in.) | 1.8 | 1.8 | 1.9 | 2.3 | 2.3 | 1.2 |
| Recharge (in.) | .85 | .85 | 0.88 | 1.12 | 1.12 | .52 | |
| Ratio (percent) | 47 | 47 | 48 | 49 | 49 | 44 | |
| July | Precipitation (in.) | 1.0 | .7 | .9 | 1.0 | 1.0 | .55 |
| Recharge (in.) | .41 | .28 | .38 | .44 | .41 | .20 | |
| Ratio (percent) | 42 | 39 | 41 | 42 | 42 | 37 | |
| August | Precipitation (in.) | 1.1 | .9 | 1.0 | 1.2 | 1.2 | .63 |
| Recharge (in.) | .46 | .38 | .41 | .50 | .51 | .24 | |
| Ratio (percent) | 43 | 41 | 42 | 43 | 43 | 38 | |
| September | Precipitation (in.) | 1.2 | 1.3 | 1.4 | 1.6 | 1.7 | .80 |
| Recharge (in.) | .53 | .56 | .61 | .72 | .79 | .32 | |
| Ratio (percent) | 44 | 44 | 45 | 46 | 47 | 40 | |
| October | Precipitation (in.) | 2.1 | 2.0 | 2.2 | 2.6 | 2.6 | 1.2 |
| Recharge (in.) | 1.0 | .95 | 1.1 | 1.3 | 1.3 | .51 | |
| Ratio (percent) | 49 | 48 | 49 | 51 | 51 | 43 | |
| November | Precipitation (in.) | 2.9 | 3.1 | 3.5 | 4.0 | 4.3 | 2.1 |
| Recharge (in.) | 1.5 | 1.6 | 1.9 | 2.2 | 2.4 | 1.0 | |
| Ratio (percent) | 52 | 53 | 54 | 55 | 56 | 49 | |
| December | Precipitation (in.) | 3.2 | 3.6 | 3.7 | 4.4 | 4.6 | 2.2 |
| Recharge (in.) | 1.7 | 2.0 | 2.0 | 2.5 | 2.6 | 1.1 | |
| Ratio (percent) | 53 | 54 | 55 | 56 | 57 | 49 | |
| Annual | Precipitation (in.) | 24 | 25 | 26 | 31 | 32 | 16 |
| Recharge (in.) | 12 | 13 | 13 | 16 | 17 | 7.3 | |
| Ratio (percent) | 49 | 50 | 50 | 52 | 52 | 45 | |
U.S.
Department of the Interior | U.S. Geological
Survey
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