Mapping of flooding risk from stormwater in the city of Nablus and the management and design of the stormwater drainage system

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Ekram Saleh
Hassan Zeid
Haya AboZant
Mohammad Abu Sanfa
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In several cities around the world and here in the West Bank, stormwater drainage is an on going issue of concern. Failure to efficiently dealing with stormwater drainage leads to disastrous problems. This challenging situation is the case in the City of Nablus. The city witnesses yearly huge amounts of rainwater that becomes overland flow. Thanks to the presence of increasing urbanization and impervious surfaces, besides the mountainous topographic nature of the city and its steep slopes, the roads of the city face severe floods and high runoff rates and depths. These floods take part in traffic-related problems, economic and human losses, and ruining the image of the city. While this is not easy to be handled, the Municipality of Nablus and specifically the Department of Water and Sewage (DWS) spent and exerted high efforts in trying to manage this situation. However, they could not control it completely and conveniently. This project will focus on defining and locating the flooding hotspots in Nablus City to be represented on a flooding risk map that depends mainly on the assessment of flooding risk for these areas. This assessment was implemented by referring to published questionnaires, field investigations, direct observations, formal interviews with the employees of DWS, interviews with residents living or working in these highlighted areas, and documented videos from the social media on these hotspots, that concentrated mainly on studying the slopes and heights of the area. Based on that assessment, the area of interest was chosen to be Wadi Attofah . It was chosen to be given the prime concern for its priority and most challenging problems. To alleviate the effect of urbanization and high runoff for Wadi Attofah, flooding management was conducted by developing models for analysis and redesign alternatives for the drainage network using ArcMap and StormCAD software which mainly depends on the rational method. Then, according to the results of the alternatives and the different scenarios, and comparing them by many parameters like, cost, the ease and ability of implementation, and engineering sense, the best alternative and recommendations will be illustrated by the end of the project