Author(s): Abbas Roozbahani, Reyhaneh Shariat
Linked Author(s): Abbas Roozbahani
Keywords: Risk assessment, storm water drainage, autodesk SSA, fuzzy, GIS
Abstract: Urban flood management is one of the most important issues that the governments and managers face today. In recent years, due to climate change, old storm water drainage systems as well as the mismanagement of these infrastructures, considerable damages have occurred in major cities around the world, especially in Iran. One of the most practical methods to manage these complex urban systems is using risk assessment techniques to be able to take the uncertainties in design and operation into account. In this paper, a framework for comprehensive risk assessment of storm water drainage systems is presented. This framework consists of three main parts: Determination of the probability of flooding using the hydraulic and hydrologic modeling, calculation of consequences as a function of vulnerability and damage caused by flooding and finally risk estimation regarding the probability and consequence parameters. For the first stage, Autodesk SSA model was used to simulate the existing drainage system and the critical points and channels are identified by considering the different hydrological return periods. In the second stage, by using the capabilities of GIS and definition of economic, social and technical criteria, consequence parameter is estimated based on spatial decision making approach. Finally, the risk of flooding is calculated using fuzzy weighted approach to consider the uncertainties. Efficiency of a part of the proposed methodology is examined in one of the strategic and overcrowded regions in Tehran City. The proposed approach is able to reduce the flooding risk of the mentioned region and other similar cases
Year: 2017