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Water 2017, 9(7), 548; https://doi.org/10.3390/w9070548

Evaluating the Effects of Low Impact Development Practices on Urban Flooding under Different Rainfall Intensities

1,2,3
and
1,2,3,*
1
Center for Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China
2
Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China, Sun Yat-sen University, Guangzhou 510275, China
3
Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou 510275, China
*
Author to whom correspondence should be addressed.
Received: 30 March 2017 / Revised: 26 June 2017 / Accepted: 12 July 2017 / Published: 24 July 2017
(This article belongs to the Special Issue Hillslope and Watershed Hydrology)
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Abstract

Low impact development (LID) is an important control measure against extreme rainfall events and is widely applied to relieve urban flood disasters. To investigate the effects of LID practices on flooding control under different rainfall scenarios, this paper constructs a rainfall–runoff model based on the storm water management model (SWMM) for a typical residential area in Guangzhou, China. The model is calibrated by using observed rainfall and runoff data. A total of 27 rainfall scenarios are constructed to simulate the change characteristics before and after the LID practices. Also, the projection pursuit method based on a particle swarm optimization (PSO) algorithm is used to assess the flooding characteristics. The results show that the constructed rainfall–runoff model can closely reflect the relationship between rainfall and runoff, with all Nash–Sutcliffe coefficients of efficiency (NSE) exceeding 0.7. It was found from the simulation and assessment of the constructed rainfall scenarios that the changes in rainfall characteristics have a considerable impact on the constructed drainage system and that LID practices can properly control the floods. However, with an increase in rainfall peak coefficient, intensity or duration, the control effects of LID tend to reduce. Particularly in the scenario of relatively high rainfall intensity, the impact of rainfall duration and the rainfall peak coefficient on the LID practices is minor. View Full-Text
Keywords: urban drainage system; different rainfall scenarios; control characteristics; urban runoff control; flood mitigation; low impact development (LID); China urban drainage system; different rainfall scenarios; control characteristics; urban runoff control; flood mitigation; low impact development (LID); China
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Zhu, Z.; Chen, X. Evaluating the Effects of Low Impact Development Practices on Urban Flooding under Different Rainfall Intensities. Water 2017, 9, 548.

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