This study presents a five alternative systems for
the protection of old lined mesqas. The main causes of damages
were identified and the hydraulic calculations for mesqas were
carried out. The suggested technical alternatives for old lined
mesqas were; 1- U-shape reinforced concrete section under the
ground level; 2- U-shape reinforced concrete section above the
ground level; 3- Reinforced concrete pipe mesqa; 4- Fiber
reinforced concrete lined mesqa; and 5- Grouted stone pitched
lined mesqa. The design aspects of these five alternatives were
analyzed and deliberated. The most promising alternative for
protecting old lined mesqas is fiber reinforced concrete lining.
Also, the grouted stone pitched lined mesqas economically
recommended