الفهرس 
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Abstract
With the increasing trend of barrage replacements in Egypt, especially for those built before the High Dam in 1971, there is a need to reduce their construction costs. Barrages/regulators are structures used to control water levels along irrigation canals. The main elements of a barrage/regulator consist of a floor, abutments, piers and a bridge. The cost of a barrage depends primarily on its floor and secondarily on its abutments, piers and bridge. There are two methods for designing the barrage floor including (a) the rigid method and (b) the flexible method. In this thesis, two new models are implemented in MATLAB to design barrage elements using both the rigid and flexible methods. The design models are coupled with the shuffled complex evolution algorithm, developed at the University of Arizona (SCE-UA). This developed framework was applied to twelve existing barrages to demonstrate its efficiency and to obtain the most economical solution. The results proved that using the flexible method provides superior results compared to those of the rigid method. The developed framework provided good solutions for the studied case using both methods.