Abstract
Present study was conducted at al Shuwaja depression east of wasit to evaluate the impact of surface water and it is effect on regional ground water. The study done with a system of 38 wells along line of 38 km passes the area of study. The work divided the line of study area in to three regions, one called the mid-section locate in the path of flood flow, and the other first and third on shoulder of the depression, right and lift. To assess the level of the pollution in ground water. The study shows an effect of the surface water on concentration of Mg, Cl and Na by increasing the concentration in depression in comparism with the other sector’s first and third. Also the study show that the effect of flood on ground water was to decrease the concentration of total dissolved solids (TDS), TSS, NaCl, and SO4. The study suggest to avoid the harem effect of water in depression on ground water by optimize and reduce the detention time of the flood water by pumping it to Tigris River at effluent of depression.