Integrated stormwater management in coastal cities

Farhad Yazdandoost, Ali Asghar Aghazadeh Abri

Friday 3 july 2015

12:54 - 12:57h at Europe 2 (level 0)

Themes: (T) Extreme events, natural variability and climate change, (ST) Flood resilient cities and infrastructures

Parallel session: Poster pitches: 15I. Extreme - Society & Resilienty

Investigation and assessment of the effects of tidal actions on stormwater outfalls of urban areas in the vicinity of coasts and shorelines are of great importance. It may be shown that due to independence of pluvial and tidal conditions for the majority of the cases, stochastic and probabilistic approaches should be resorted to. Combination of urban events return periods with those of the tidal conditions may be addressed through joint probability approaches. A toolbox has been proposed here whereby initially, urban runoff modeling would be performed using the EPA SWMM model. This is a widely used program for simulating urban runoff quantity and quality with the capability of simulating the water depth and flood volume as well as time of flooding above the urban drainage systems nodes. The combined effects of tidal interaction with these parameters may then be assessed for varying individual events through a joint probability approach. Effects of land use change and the resulting social and economic as well as quality/environmental implications may then be investigated through scenarios generation and their subsequent ranking by multi criteria decision making (MCDM) tools. The proposed toolbox has been utilised for assessment and design of a storwater system for the city of Bandar-Abbas, center of the Iranian province of Hormozgan, by the Persian Gulf. Results indicate that the proposed tool may be ideally utilisd for planning and decision making under varying scenarios vis a vis socioeconomic, environmental and land use implications.