الفهرس 
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Abstract
The New Assiut Barrage and Hydropower Plant (NABHP) is planned and conducted as a replacement for the existing Assiut Barrage located at Assiut City, 545 km downstream from Aswan on the River Nile in the Arab Republic of Egypt. The purpose of this research work is to determine the impact of the new Assuit barrage construction on the surrounding groundwater levels and to predict the future drawdown for the aquifer due to the increase in the abstraction for different uses. the study area data (ground surface elevations, geological setting, hydrogeological setting, hydrometric data of River Nile, groundwater abstraction, irrigation and drainage facilities and piezometer monitoring network) were collected, obtained and measured for the formulation of the numerical model (FEFLOW). The FEFLOW model was used to build a groundwater flow model to simulate the behavior of the flow system under different stresses. The model has been calibrated for both steady state and transient conditions against the data from observation wells. Three scenarios have been considered to predict aquifer responses under different barrages and water courses operation conditions as well as groundwater abstraction rates. First scenario indicates that the water level in upstream and downstream of New Assuit Barrage assumed rising by 0.5 m, the results gave an average rising in the groundwater levels ranged from 0.31to 0.46 m above the head values of year 2017. The minimum value was for El-Fath district downstream the barrages while maximum value related to the Sidfa & Ganaem district upstream the barrages. For 2nd scenario where the water level in upstream of New Assuit Barrage assumed rising by 1.0 m, the results indicated that an average rising in the groundwater levels ranged from 0.61to 0.88 m above the head values of 2017. The districts of El-Sahel and Sidfa & Ganaem upstream the barrages had the minimum and maximum value of rising respective. For 3rd scenario where the water level in upstream and downstream of New Assuit Barrage assumed rising by 0.5 m with variable abstractions that depend on the supposed relationship between the abstraction rate and time. The expected abstractions may be increased by 30% to 170% by the years 2022 to 2042 respectively than year 2017. The rates of abstraction were predicted ranged from 1.9to 3.8 million m3/day respectively. The maximum predicted drawdown below 2017 was occurred in section 2 which are Sidfa & Ganaem and El-Badary districts upstream the barrages and was ranged from 2.6m to 27.2m for years 2022 to 2042.