| Summary: | Tanta Navigation canal is a 38.0 km long main canal serving 65,000 ha. in the Nile Middle Delta of Egypt. The main branch of Tanta canal is El-Kased canal with 34.0 km long, and serving 60% of Tanta Canal served area.The main problem was the inability to convey the required water supply to the second reach of El-Kased canal as it requires high-water levels at its head, which couldn’t be maintained because of the big difference between water levels required in Tanta canal and water levels in the drains parallel to the canal led to bank collapse between Tanta canal and Tala drain in 2006.A simulation model was used to investigate the problem and propose feasible solutions. The results showed that the dredging of Dalel El-Kased canal improved the water convey efficiency and hydraulic performance of the canal enabling maintaining high water levels upstream Sorad regulator. On the other hand, constructing a new regulator at km 18.5 is another solution to solve the irrigation problem in El-Kased canal and the conjoint bank between Tanat canal and Tala drain. However, this solution requires further investigations of the impact of this regulator on the water table in the surrounding areas. Keywords: Main canals, Water management, Water distribution, Convey efficiency, Rehabilitation, Irrigation, Drainage
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