Lea Rudee is the Founding Dean of UCSD's Jacobs School of Engineering. He has photographed the Tijuana River, which originates in both the United States and Mexico, from its sources to its mouth in the Pacific Ocean. Along the way, the river provides water to both Tijuana and San Diego, is an urban storm sewer in Tijuana, and ends in a U.S. nature preserve--a remarkable journey for such a relatively short river.