FILE - In this March 26, 2014 file photo, Abelardo Martinez works to clear a blocked duct which leads water to his fields near Colonia Coahuila, Mexico, through a maze of canals from the Colorado River. The U.S. and Mexico have agreed to expand a far-reaching conservation agreement that governs how they manage the overused Colorado River, which supplies water to millions of people and farms in both nations. Officials of U.S. water districts say the agreement to be signed Wednesday, Sept. 27, 2017 calls for the United States to invest $31.5 million to improve Mexico's water infrastructure, with the resulting water savings to be shared by users in both nations and by environmental projects. (AP Photo/Gregory Bull, File)
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