Management of Urban Drainage System Using Integrated MIKE SWMM and GIS

Abstract

Nowadays along with the development of society, its impervious areas increase and therefore amount and volume of runoff<br><br>accrue. Thus flood control in a pedestrian crossing, disorder of transport, contaminant flow and inundation in a residential area are<br><br>the worry of designer and city manager. The primary goal of this research is simulation and evaluation of urban drainage system of<br><br>East Eghbal basin which includes part of urban watershed in south and southeast of Mashhad city in Iran. The area of this basin is<br><br>about 71 Km2. Due of complicacy in the simulation of an urban drainage system, after calibration and validation, MIKE SWMM<br><br>used for rainfall - runoff simulation and hydraulic response evaluation of urban drainage system. By investigation in historical rains,<br><br>17 and 3 storms (include 11 consecutive storms) were selected for single and continues simulation respectively. The rainfall chosen in<br><br>this study was 30 /4/1998. It had greater peak hydrograph on all sub-catchments. The amount, average intensity, and duration of this<br><br>rainfall were 14.1 mm and 4.1 mm/hr and 206 min, respectively. The results of the simulation showed that 6 conduits of urban<br><br>drainage system have difficulty for carrying of the storm water. Finally, based on topographic maps, flooded channels position and<br><br>surveying the study area, 3 appropriate natural sites for storm infiltration basins were recognized. The uUrban drainage system was<br><br>evaluated again by the presence of these basins and results showed a noticeable reduction in the flood.