What does become river water is subject to a more than century-old agreement on who can take how much. Lothar Rowe bought a parcel of land with its own well to ensure that he had water for his horses in Rio Verde, Arizona © Frederic J. But well owners in Rio Verde Foothills say such a body would effectively be sucking their water out from underneath them and redistributing it to others. Wendy and Vance Walker use water coolers to collect rainwater from their rooftop to flush their toilets © Frederic J. No water in Rio Verde," reads a sign he put up in front of his house warning people who come to tour the half-built housing estates nearby.