الفهرس 
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Abstract
This Thesis deals with the study of the characteristics of the three Dimensional flow expansion. apractical Solution of the problem can be achieved using the continuity, energy, and momentum equation.Experimental investigation and fully discussion of the case is represented. A spescial flume was constructed for this study and wide range of vertical and horizontal angies of expansion was tested. A repreentation of tunnal inlets is examined and the results and discussion of the case is presented in the thesis.