Grand Canyon flood results erode A half-year after a manmade flood built bigger sandbars and beaches in the Grand Canyon that are boon to native fish and plants, U.S. Geological Survey researchers say beaches are again eroding. The data at this point is incomplete, researchers say, but some of the photos to date point to eroding sand bars as water releases from Glen Canyon Dam vary to meet peak power demands and interstate water-sharing agreements. A group of federal agents, tribes, environmentalists and power agencies that advises the Interior Department on how the Colorado River in Grand Canyon should be managed is meeting in Flagstaff Tuesday and today to discuss the latest research and propose next steps. A budget up for discussion by the group today could determine whether there are any more experimental floods in the next five years. The next one called for in an earlier report by the Bureau of Reclamation is not until 2012....