الفهرس 
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Abstract
Egypt faces many challenges in terms of the water sector and water resources due to population growth and increasing water needs in exchange for the stability of water resources. Egypt’s per capita share is continuously declining to the extent that Egypt is under the water poverty line. According to international standards, this value may decline to be 500cubic meters/capita/year in the year 2025, which would indicate a water scarcity. El Mahmoudia canal is one of the most important canals in the West Delta of Egypt. The canal is 77.10 km long. It feeds Alexandria and El Beheira governorates with municipal and industrial demands in addition to irrigate about 280,000 feddans. The main objective of this study is to investigate the proposed future plan of drinking water in Alexandria city from El Mahmoudia canal to meet the increase of water demand. Different scenarios are proposed to investigate their effects on the water levels and discharges in the canal. In order to perform the hydraulic model for different scenarios of El Mahmoudia canal, HEC-RAS model has been used. Measured water levels, discharges and cross sections were applied as model input. The hydraulic model was used to manage supply and requirements water for the canal during July, which represents the maximum requirement during the agricultural season The first scenario is pumping excess water through pipelines at upstream Kafr Al Dawar lock to El-Seyouf drinking water station in Alexandria. The second scenario is reshaping cross sections from Kafr Al Dawar lock in El Beheira governorate to El Seyouf drinking water station to allow high water level at El-Seyouf station to improve its operation and efficiency. The results have been analyzed for each scenario. The study showed that good agreements were obtained between the numerical model results and measured water levels. The results of the first scenario showed that the current status of El Mahmoudia canal, by its hydraulic situation, does not allow any expansion for future drinking water. Meanwhile, reshaping of El Mahmoudia canal cross sections, as a second scenario, can improve water level along the canal, which in turn improve effacing of drinking water stations. It is recommended to re-change the crop pattern along El Mahmoudia canal to meet the future water resource in the canal.