Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 9 1 2009 10.5194/nhess-9-61-2009 http://www.nat-hazards-earth-syst-sci.net/9/61/2009/ http://www.nat-hazards-earth-syst-sci.net/9/61/2009/nhess-9-61-2009.html http://www.nat-hazards-earth-syst-sci.net/9/61/2009/nhess-9-61-2009.pdf 61 75 2009-01-20 Structural master plan of flood mitigation measures A. Heidari al.heidari@iwpco.com Iran Water and Power resources development Co. (IWPC), Tehran, Iran Flood protection is one of the practical methods in damage reduction. Although it not possible to be completely protected from flood disaster but major part of damages can be reduced by mitigation plans. In this paper, the optimum flood mitigation master plan is determined by economic evaluation in trading off between the construction costs and expected value of damage reduction as the benefits. Size of the certain mitigation alternative is also be obtained by risk analysis by accepting possibility of flood overtopping. Different flood mitigation alternatives are investigated from various aspects in the Dez and Karun river floodplain areas as a case study in south west of IRAN. The results show that detention dam and flood diversion are the best alternatives of flood mitigation methods as well as enforcing the flood control purpose of upstream multipurpose reservoirs. Dyke and levees are not mostly justifiable because of negative impact on down stream by enhancing routed flood peak discharge magnitude and flood damages as well. Cheng, S T., Yen, B C., and Tang, W H.: Stochastic risk modeling of dam overtopping, in: Reliability and Uncertainty Analyses in Hydraulic Design, edited by: Yen, B C. and Tung, Y K., ASCE, 123–132, 1993. Flood Damage Reduction Analysis: HEC-FDA User's Manual, US Army Corps of Engineers Hydrologic Engineering Center, Davis, CA, 72~pp., 1998. Tang, W H. and Yen, B C.: Probabilistic inspection scheduling for dams, in: Reliability and Uncertainty Analyses in Hydraulic Design, edited by: Yen, B C. and Tung, Y K., ASCE, New York, 107–122, 1993. Tung, Y K.: Risk-based design of flood defense systems, Flood Defense, Science Press, New York, 71–81, 2002. Tung, Y K. and Mays, L W.: Risk and reliability model for levee design, Water Resour. Res., 17(4), 833–842, 1981a. Tung, Y K. and Mays, L W.: Optimal risk-based design of flood levee systems, Water Resour. Res., 17(4), 843–852, 1981b. van Stokkom, H T C. and Smits, A. J. M.: Flood defense in the Netherlands: a new era, a new approach, Flood Defense, Science Press, New York, 34–47, 2002. Vrijling, J K.: Development in Probabilistic Design of Flood Defenses in the Netherlands, in: Reliability and Uncertainty Analyses in Hydraulic Design, edited by: Yen, B C. and Tung, Y K., ASCE, 133–178, 1993. Yen, B C. and Jun, B H.: Risk consideration in design of storm drains, Proceedings, Third IAHR/IAWPRC International Conference on Urban Storm Drainage, Chalmers Univ. of Technology, Goteborg, Sweden, 2, 695–704, 1984.