The project will utilize standard hydrogeologic investigation and groundwater modeling techniques to investigate potential impacts on wetlands and the Merced River from groundwater withdrawal for public water supply in Yosemite Valley. Much of the work could be done through a Cooperative Ecosystem Studies Unit agreement with Dr. Graham Fogg and a student at UC Davis. The primary project area is centered on the three water supply wells near the confluence of Yosemite Creek with the Merced River and potentially affected wetlands in Cook's, Sentinel, and Leidig meadows.