Mountain-Block Recharge in the Santo Tomas Valley,Baja California,Mexico

Mountain-block recharge(MBR) to adjacent basin aquifers can be a significant source of groundwater in arid and semi-arid regions.Unfortunately,geologic complexities within the mountain block often limit our understanding of this indirect form of recharge. Secondary permeability,resulting from faults and fractures,allows rainwater to infiltrate the crystalline