据美国媒体消息，12月16日美国航空航天局（NASA）发布研究报告指出，解决加州持续3年的大旱尚需42万亿升水，是美国最大水库蓄水量的1.5倍。
上次“菠萝快车”风暴带来的降水可谓是“杯水车薪”。本次研究数据首次使用NASA的重力监测及气象试验（Gravity Recovery and Climate Experiment）卫星，估算解决干旱所需的地下水量得出。
部分原文报道如下：
If you figured the storms that wreaked havoc on California this month would signal the end to the state's historic drought, think again.
Storms this month dropped 11 inches of rain in some parts of the state and triggered mudslides in other areas, damaging many homes. The deluge helped bump up the state's largest reservoir from 26 percent to 31 percent of capacity and dumped 94 billion gallons - about a one-year supply for 540,000 families.
相关链接：<http://www.cbsnews.com/news/what-will-it-take-to-end-californias-drought-11-trillion-gallons-of-rain/>
<http://science.nasa.gov/science-news/science-at-nasa/2014/16dec_drought/>
<http://rt.com/usa/215163-california-drought-nasa-us/>
日期：2014-12-19
