Flood reduction analysis on watershed of LID design demonstration district using SWMM5

Abstract

2012) Flood reduction analysis on watershed of LID design demonstration district using SWMM5, Desalination and Water Treatment, 38:1-3, 255-261, A B S T R AC TUrban development is the primary cause of the expansion of impervious areas. Urbanization reduces infi ltration of rainwater, increases runoff volume, and fi nally has an effect on the hydrological cycle and urban environment. To solve these problems, Low Impact Development (LID) methods have been used to restore the natural hydrology of predevelopment sites using site design techniques such as infi ltration, evaporation, and retention. SWMM5 has been developed as a model to analyze the hydrologic impacts of LID facilities. This study performed hydrologic analysis and evaluated the fl ood reduction effect of the Jangjae Stream watershed by the design of LID facilities of the rainwater management demonstration district of AsanTangjung New Town (Korea). LID facilities in this study were comprised of infi ltration trench, rain barrel, vegetation swale, etc. SWMM5 was calibrated using rainfall data of the 7th and the 14th of July, 2011 and was verifi ed using rainfall data of the 10th and the 11th of August, 2011. This study analyzed fl ood reduction effect on 50 to 100 y return period. Based on the results of this study, the reduction of fl ood peak discharge by each return period of storms was estimated to be about 7 to 15%.

The effects of low impact development on urban flooding under different rainfall characteristics

“…Lee et al (2012) found that the use of LID facilities in a demonstration district of AsanTangjung New Town can reduce the flood peak discharges of 50-and 100-year return periods by about 7e15% at a wider catchment scale. Holman-Dodds et al (2003) monitored disconnected impervious areas and recorded reduced runoff at the site, as compared to traditional development.…”

Low impact development implementation: Investigation on the hydrologic performance of bioretention via experimental models

“…Lee ve diğ. [28] tarafından yapılan çalışmada kentleşme ile birlikte yüzeysel akış debisinin arttığı ve biyotutma, bitkisel kanal, geçirgen kaldırım, yeşil çatı ve yağmur tankı gibi DEK uygulamalarından sonra debinin azaldığı görülmektedir. Dolayısıyla DEK uygulamaları ile taşkın ve sel riskinin önlenmesine yönelik deneysel ve saha çalışmalarına ağırlık verilmelidir.…”

Flood Spatial Modeling in Northern Iran Using Remote Sensing and GIS: A Comparison between Evidential Belief Functions and Its Ensemble with a Multivariate Logistic Regression Model

“…The results showed that the EBF model had the highest accuracy in predicting flood susceptibility within the catchment, in which 15% of the total areas were located in high and very high susceptibility classes, and 62% were located in low and very low susceptibility classes. These results can be used for the planning and management of areas vulnerable to floods in order to prevent flood-induced damage; the results may also be useful for natural disaster assessment.In recent years, many statistical and probabilistic models have been tested to prepare flood susceptibility maps [9,10]. Geographic Information System (GIS) has been used as an effective tool for spatial analysis and data manipulation due to its ability to handle large amounts of spatial data [11].…”