Watch Surface Water: A Day In The Life Of The Rio Grande

The Rio Grande is one of America's longest rivers; its Texas section forms a natural border between the U.S. and Mexico. Competing human claims for it are viewed through the eyes of two young women, a whitewater rafting guide in upstream New Mexico and a teenager downstream near El Paso. Viewers learn that communities' demands on the Rio Grande take so much of its water that southern Texas and Mexico often see only a dry, sandy riverbed.