Jon & Melissa Mt Hood OPB Apr 2009 2 : 無料・フリー素材/写真
Jon & Melissa Mt Hood OPB Apr 2009 2 / USDAgov
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | U.S. Department of Agriculture’s (USDA) Natural Resource Conservation Service (NRCS) snow surveyors approach a snowpack telemetry site (SNOTEL) on Mount Hood, OR. SNOTEL sites allow NRCS to predict the amount of spring and summer snowmelt in twelve Western states where 50 to 80 percent of all the water used comes from snowmelt. USDA NRCS snow surveyors check each site at least once a year to perform routine maintenance. |
| 撮影日 | 2009-04-06 17:22:49 |
| 撮影者 | USDAgov |
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