Urban runoff management in order to reduce flood risks (case study: phase 2 of the new city of Hashtgerd)
Paper Details
Urban runoff management in order to reduce flood risks (case study: phase 2 of the new city of Hashtgerd)
Abstract
Flooding in urban areas due to the defect or any inefficiency in urban drainage systems causes great damage to public and private buildings and other infrastructures. Therefore, in order to management of runoff, phase 2 of the new city of Hashtgerd was selected. To simulate the rainfall-runoff process, SWMM model was used. Eight factors including percentage of impervious area, slope, width, percentage of impervious area without surface storage, n-Manning’s coefficient of impervious areas, n-Manning’s coefficient of pervious areas, depth of depression storage on pervious and impervious areas were investigated. Results of model sensitivity analysis showed that n-Manning’s coefficient of impervious areas, width, slope and percentage of impervious areas were more effective in changing the peak flow. According to the results, the possibility of flooding is low due to the barren lands and high permeability of the study area and it is more important in areas near the basin outlet. However, with regard to the urban sprawl in recent decades, city residents and officials will suffer from flooding in future. Therefore, this model could be used for predicting the risk of flooding, drainage design and cost estimate, urban management, and identifying priority areas for flooding problem.
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