Evaluation of detention tanks for reducing urban flooding

Document Type : Research Article


1 Soil Conservation and Watershed Management Research Department, Mazandaran Agriculture and Natural Resources Research and Education Center, AREEO, Sari, Iran.

2 Faculty of Environmental Sciences, Haraz Institute of Higher Education, Amol, Iran


The sustainable urban drainage systems approach or LID devices (low impact development) are designed to detain, store, infiltrate, or treat urban runoff, and so reduce the impact of urban development. The purpose of this research is to evaluate the application of detention tanks from low-impact structural methods in order to eliminate or reduce the rainfall flood in the collecting network and conveyance of surface drainage water in small part of the urban area in Babolsar city. By using the simulation of rainfall-runoff process at the catchment area and the runoff routing in the drainage networks with the SWMM, critical nods were identified. The results showed that some parts of system have high capacity and the others have low capacity which induces inundations. Several simulations were performed with considering detention tanks by different dimensions in the system and eventually the best option was selected. Considering a serial detention tank, no inundation occurred in 2 and 5 years return periods but for 10 year return period, inundation happened with 125 m3 flood volume. However, constructing parallel detention tank with same dimensions and place of serial type caused no inundations. Results showed that parallel detention tank has better function comparing with serial one. The results of this study emphasize the use of flood hydrodynamic simulation models to evaluate different scenarios of urban flood management.


Main Subjects

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