SOURCE OF BARCELONA WATER SHIPMENT. “The Ogallala Aquifer in central US is being rapidly depleted by intense municipal use, and in 2008, 438 million gallons of water were shipped to Barcelona, Spain, to relieve the worst drought that the region had experience in over 60 years.”
http://blogs.ei.columbia.edu/2010/04/13/the-guarani-aquifer-a-little-known-water-resource-in-south-america-gets-a-voice/