the Coachella Canal Lining Project was named the 2007 Project of the Year by the San Diego Chapter of the American Society of Civil Engineers (ASCE)....That seepage was sustaining farms and ecosystems south of the border, and both will now dry up. As I pointed out here, not all seepage is bad seepage.
Prior to lining the last remaining earthen section of the canal with concrete, approximately 26,000 acre-feet of water seeped through the canal annually. Now, instead of losing this precious resource through seepage, the conserved water is conveyed to San Diego for use.
Bottom Line: Ecosystems cross political borders, but engineers can keep water from doing so. Too bad for the foreigners -- and Nature.