Deficiency of surface water resources in semiarid area makes the groundwater the most preferred resource to assure population increased needs. In this research we are going to quantify the rate of groundwater recharge using new hybrid model tack in interest the annual rainfall and the average annual temperature and the geological characteristics of the area. This hybrid model was tested and calibrated using a chemical tracer method called Chloride mass balance method (CMB). This hybrid model is a combination between general hydrogeological model and a hydrological model. We have tested this model in an aquifer complex in the region of Djelfa (Algeria). Performance of this model was verified by five criteria [Nash, mean absolute error (MAE), Root mean square error (RMSE), the coefficient of determination and the arithmetic mean error (AME)]. These new approximations facilitate the groundwater management in semi-arid areas; this model is a perfection and amelioration of the model developed by Chibane et al. This model gives a very interesting result, with low uncertainty. A new recharge class diagram was established by our model to get rapidly and quickly the groundwater recharge value for any area in semi-arid region, using temperature and rainfall.

Useable drinking water in many part of the world can be achieved from many underground sources that every part of ground has there on special feature. Underground water has less pollution than surface water also has good smell, less foggy and less balance of microbe, than surface water. In many part of the world they are using surface water with different methods of water filtration to prepare the need of their citizen. Afghanistan is one the limited country that its people are using underground water, in Herat province is also the same. Unluckily, there is no any water filtration system, so people use underground water for drinking and laundry, in this research we analyzed four districts of Herat province till to determine the quality of water in them. The samples are experiential section of science faculty of Herat University. The results of this research can be profitable for this organization.