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The mathematical model is an idealization of a real system and it can be used to study the operationscenarios of an existing or a proposed system. The 1-D Sobek model is a mathematical model whichis chosen to simulate the Fayoumi Standard weirs which have been modified by adding pipes toconvey much water to downstream direction. Measurements of discharge with these structures arecomplicated due to existence of the pipes. Field measurements are carried out and simulated usingmathematical model to investigate the effect of installing pipes on a clear over fall weir. BahrHassan Wasef is simulated with six cross-sections. A kilometer from the beginning of the channelincluding weir is represented. The used data of cross-sections altitudes, discharges, water levelsupstream and downstream the weir, and the head over weir for Bahr Hassan Wasef were measuredat the field by a Staff from Ministry of Water Resources and Irrigation in Al-Fayoum and AssiutIrrigation Directorates. The effect of downstream water depth is taken into consideration. The flowresults of piped weir are compared with those of weir without pipes. It is found that there is a largedifference between them. Equations and curves for computing the discharge of piped weirs aredeveloped using multiple regression analysis on the bases of dimensional analysis. This researchmight help irrigation engineers to accurately estimate the discharge for such structures.

SIMULATION OF FLOW OVER WEIRS WITH BOTTOM PIPES (CASE STUDY: BAHR HASSAN WASEF WEIR)