Hydrogeology is responsible for the Groundwater investigation as the Balochistan comprises 17 river basin, each basin has thousand square kilometers of water shed area. Each basin has different geology comprising alluvial deposits making alluvial aquifer which is the major source of groundwater of Balochistan. The hard rocks are also important regarding groundwater and surface water control. Highly fractured rocks, fissure joints and faults are very important for groundwater recharge. The hydrogeological studies are very essential especially for Balochistan because there is still many unexplored area. Hydrogeological studies needs calculation of catchment area of every large stream, delineation of recharge zone, well inventory, and demarking of dam sites.