Abstract: The aquifers beneath irrigated lands in the southwestern United States are composed of alluvial deposits that, together with subsurface geologic conditions and water‐level elevations, largely determine the movement of ...

Abstract: Deep percolation of irrigation return flow is a major source of recharge beneath most irrigated areas in California. Tile drainage, soils, water in the vadose zone, and shallow groundwater have been studied. Nitrate, ...