Page - 1267 - in Book of Full Papers - Symposium Hydro Engineering

10 to 20 m. They all pass discharges greater than 2000 m3/s; they are all classified, according to ICOLD, as large dams. The second Group of Regulators (Diversion dams) is the Head (Intake) of Major Canal from Nile (known in Egypt as RAYAH). The third group of regulators is the Intermediate ones that built on the main and branch canals in the points of canal width or bed slope changes. The fourth group is for all other regulators. Excluding Aswan dams, the grand hydraulic control structures on the Nile and delta in Egypt are under the jurisdiction of the Reservoirs and Grand Barrages Sector (RGBS) in the Ministry of Water Resources and Irrigation. The structures under the jurisdiction of RGBS are 153 structures. RGBS is responsible for their construction, maintenance, and rehabilitation or replacement whatever necessary to maintain efficiently functioning. Fig. 1 Major hydraulic control structures in Egypt Les principales structures de contrôle hydraulique en Egypte Hydraulic control structures in Egypt are mostly masonry structures, with few cases of earth fill dam portions. As a concrete or a masonry structure with movable gates, its defects occur due to deterioration and loss of material strength after many years of different operational circumstances, weathering effects, and 1267