الفهرس 
Literature ReviewOnly 14 pages are availabe for public view
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Abstract
Reducing construction costs of flood protection structures is of growing necessity in this financially challenging environment. Therefore, the aim of this dissertation is to investigate the hypothesis that flash flood damages could be reduced significantly using smaller and cheaper protection structures. Accordingly, determining the relationships between the type and size of protection structure and the expected damages.
This dissertation methodology was selected through an extensive study of relevant literature and determining common shortages in assessing flood risks. Two extensively different study areas were selected; for each one, a two-dimensional hydrodynamic model was developed and run multiple time considering different protection structures. These models simulate the propagation of design flash flood and calculate the main variables controlling the flood damaging ability. Next step was to apply flood-risk relationships to assess risks over the flooded areas before any protection and if each one of protection measure was constructed. Then a multi-criteria decision support system tool was developed to automate the previous steps and to consider the relative importance of protecting different land uses. This tool utilizes analytic hierarchy process (AHP) to allow combining both of subjective and objective factors in selecting the most suitable protection alternative.
The findings from the first case study show that however, some protection structures store a large amount of water but these are not only insufficient but also even inefficient. This case study shows also that only one protection structure among a large system of planned structures could reduce the risks significantly. The second case study shows that in some situations a relationship between the required protection budget and the reduction in flood risk could easily be generated. it could be concluded that comparing all suitable protection alternatives according to the expected risks on threatened areas is very useful to determine the most economic one. This dissertation recommends developing flash flood-risk relationships to cover local characteristics for human, agriculture and structures. In addition, it recommends making additional improvements for the development multi-criteria decision support system.