奥加拉拉含水层是一个砂岩地层，位于从德克萨斯州西北部延伸到南达科他州南部，约583000平方公里土地的地下。
The Ogallala aquifer is a sandstone formation that underlies some 583,000 square kilometers of land extending from northwestern Texas to southern South Dakota.
我们的地下水使用比注入得更快并且更多，从南达科他州延伸到德克萨斯州的奥加拉拉的水量下降到150英尺。
Our aquifers are draining faster than they can be replenished, and the biggest, Ogallala, which stretches from South Dakota to Texas, has seen localized drops in the water table of 150 feet.
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