Hailu, Habtamu(PhD)Tilaye, Robel2018-06-202023-11-112018-06-202023-11-112009-10http://etd.aau.edu.et/handle/12345678/2082A computer program named HelaFlow is developed for optimal design of low-head diversion structures using visual basic.Net programming language. The program calculates the parameters of a diversion structure’s components that are set in consideration of surface flow, subsurface flow, nature of foundation soil, structural stability and economy. It solves the uplifting pressure head distribution on the structure using finite difference technique, allowing for accurate design of structures built on anisotropic and/or shallow as well as isotropic and deep permeable media. It also optimizes the parameters of components for least cost design using cost of construction of components as input. The effects of anisotropy and variation in depth of permeable media were analyzed and found to affect the magnitude and distribution of uplifting pressure head on the apron of structures. Sample designs are presented to demonstrate the capability of the software program. This study equips the design engineer with a convenient decision tool for optimal design of low-head diversion structures. Key words: diversion structure, subsurface flow, hydraulic jump, finite difference method, Anisotropy, optimizationenDiversion Structure; Subsurface Flow; Hydraulic Jump; Finite Difference Method; Anisotropy; OptimizationThesis