Measuring and Evaluating the Resilience of Urban Areas Against Urban Flooding (Case study: Tehran zone 4)

Due to the rapid growth of cities and increasing urbanization in recent decades, urban runoff and flood damage is one of the most important and fundamental issues in the field of urban management. The purpose of this study is in the first part; Quantitative simulation of floods caused by rainfall for region 4 of Tehran for the years 1349-1396 using the SWMM model.

The simulation was performed for six-hour showers with 2, 5 and 10 year return periods for 12 hours. In this research, two projects of the best management strategies (BMP) under the garden and green roof climate scenario and a combination of both scenarios to control the maximum runoff in terms of quantity and finally their efficiency in reducing the total volume of runoff out of the basin, is studied. In the second part; Evaluation and analysis of resilience caused by urban floods in the 9 districts of Tehran's 4th district in four dimensions: socio-cultural, economic, managerial-institutional and physical. This section is applied in terms of purpose and in terms of survey and descriptive-analytical methods. The statistical population of the study is the total citizens of Region 4, of which the sample size was calculated using the Cochran's formula of 384 people. According to the obtained results, the third scenario (combining the first and second scenarios) will have the greatest impact on reducing the flow depth and flow rate in the entire surface water collection network.     

Findings of the research in the field of resilience assessment and analysis showed that District 5, District 4 of Tehran is the most desirable district and District 1 and District 8, 4 are the most undesirable in terms of resilience against urban floods.

Districts 4 and 9 are ranked last in terms of resilience-cultural, economic, managerial-institutional), which indicates that this area is weak in some cases, which is to reduce the level of vulnerability. to be noticed.