Using tTEM to assess feasibility: Managed aquifer recharge, where excess water is used to recharge the groundwater aquifers, has been proposed as a means of curbing groundwater depletion in the Central Valley. However, locating new fields for recharge is difficult. The challenge is to map out the subsurface to understand where water might move, allowing water agencies to better prioritize and plan for recharge. Study by Stanford University and Aarhus University