Fault Control on Groundwater Flow in An Alluvial Aquifer, Chaman and Khojak Basins, Balochistan, Pakistan

Geological structures such as faults play a critical role in the flow of fluids reservoir by affecting its permeability. This study explores Chaman Fault distribution hydrological division, groundwater separation aquifer systems Khojak and basins. The is left-lateral strike-slip transform plate boundary located at border city Chaman, District Killa Abdullah, Balochistan. fault plays an important division subsurface, accommodating structural compartment system. studies showed that movement made impervious along line. assertion may also be confirmed drastic change water table across fault. Sharp changes Total Dissolved Solids (TDS) were observed during study. Karazes which are indigenous method irrigation present eastern foothills mountains called basin. Here shallow ≈ 6 meters comparison to western side fault, where drops ≈274 towards valley average TDS level on line 773 mg/L 1361 side. Therefore, acting barrier feeding Karezes for centuries.