Investigating the effect of land use in flooding potential of urban area (Case Study: region 1 in Tehran)
Subject Areas : مدیریت ، برنامه ریزی و آموزش محیط زیستMahdieh Saadat 1 , Bahram Malek mohammadi 2
1 - Master in environmental planning, University of Tehran. *(Corresponding Author)
2 - Associated professor of planning, management and education of environment, University of Tehran.
Keywords: : Runoff management, Urban flooding, Flood potential, Curve Number method, Land use. ,
Abstract :
Background and Objective: Tehran is one of the cities that are continuously exposed to flooding. High density and high volume of impervious surfaces in urban runoff as well as being at the foot of the mountain are the main reasons for potential flooding in Tehran. Therefore, identifying prone areas to urban flooding is considered the most important measures in reducing losses and efficient management.
Material and Methodology: In this study, the flood potential of region 1 in Tehran using the curve number method was evaluated in ArcMap software.
Findings: The curve number and infiltration map of the area was prepared by combining data and according to the land use. Then, using the maximum daily precipitation zoning maps and formulas, runoff for different return periods were calculated for the area.
Discussion and Conclusion: The results show that for the precipitation with return period of 5-year and 10-year, about 90 percent of area has high and very high flooding potential. These measures in return periods of 25 and 50 years will be the top 95 percent. Also, in the return periods of 25 and 50 years, all the areas of urban flood potential are moderate to high and area with little flood potential are not found. Furthermore, in areas where the density residential and parking is more, the cumulative effect of impervious surfaces is increased flooding potential.
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