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“Development of Regime Equations for the Design of Egyptian Canals” A Thesis Submitted to the Faculty of Engineering – Ain Shams University For the Degree of MASTER OF SCIENCE In Civil Engineering (Irrigation and Hydraulics) by Eng. Ahmed Abd El-Moniem Arafa Albably, (B.Sc. in Civil Engineering, 2012)

ABSTRACT The construction of the High Aswan Dam in Egypt led to reducing the solid suspension in water from more than 3500p.p.m. to less than 100 p.p.m. As the regime of Egyptian canals has been changed completely after the construction of the High Aswan Dam, the previously derived equations for the design of canals are not applicable anymore, and using them leads to a shortage in the carrying capacity of the canals. In the current study, extensive field measurements have been carried out on 15 Egyptian stable canals, which cover various discharges of irrigation canals starting from 5 m3/s to 50 m3/s with sandy soil and d50 range from 0.196 to 0.538 mm. Also, the old regime equations were modified, by reanalyzing the data of previous study. The previous data includes ten sandy canals, that cover the discharges in the range of 0.1 to 5 m3/sec with sandy soil and d50 range from 0.125 to 0.450 mm. Based on dimensional analysis the statistical software package (SPSS, Excel, and GraphPad Prism) were used to derive new equations. Then, applicable regime relationships for designing stable sandy channels were concluded. The new equations are useful for designing new stable canals and redesigning unstable canals with the same range. The new regime equations were verified by using the HEC-RAS program. Finally, Sensitivity analysis has been performed to investigate the effect of changing the deduced parameters on the discharge. So it is noticed that the change in the bed width (B) has the smallest effect on the discharge relative to the other parameters, such as mean water depth, hydraulic radius and wetted perimeter for the discharge starting from 5 m3/s to 50 m3/s with sandy soils and d50 range from 0.196 to 0.538 , but the change in the bed width has the largest effect on the discharge relative to the other parameters, such as mean water depth, hydraulic radius and wetted perimeter for the old data discharges in the range of 0.1 to 5 m3/sec with sandy soil and d50 range from 0.125 to 0.450 mm (modification old regime equations). https://iwaponline.com/wpt/article/15/4/999/76248/Regime-equations-development-for-the-design-of