Effective Evaluation of Infiltration and Storage Measures in Sponge City Construction: A Case Study of Fenghuang City

Jinjun Zhou,Kun Zhang,Chao Mei,Yingdong Yu,Jiahong Liu,Ying Wang,Weiwei Shao

doi:10.3390/w10070937

Abstract

In recent years, urban waterlogging problems have become more and more serious, which has led to flood disasters in some cities. The Chinese government launched the sponge city pilot construction in 2015 to mitigate the risk of urban flooding and control the runoff in source areas. Rain-runoff control is one of the main indices of a sponge city, thus, evaluating its control effect is essential for sponge city construction. This paper chose Fenghuang city, located in the west of Hunan province, as a case study area to assess the rainwater control effect by using the MIKE FLOOD model. The results showed that: (1) the total annual runoff control rate (TARCR) of sponge city design was a reasonable indicator for daily rainwater control; (2) the goal of Fenghuang Sponge City was close to the 1-year rainfall event; and (3) infiltration and storage measures could reduce but not eliminate urban waterlogging. The capacity of the drainage system should be fundamentally improved to enhance the prevention standards of urban waterlogging.

Highlights

Under the influence of urbanization and climate change, urban areas have faced serious flood and waterlogging problems in recent years [1,2]
The results showed that the designed rainfall corresponding to the goal of total annual runoff control rate (TARCR) of the Fenghuang Sponge City design was less than a 1-year rainfall
This study focused on sponge-city controlled rainfall runoff, selected Fenghuang City as the research object, and revealed the design method and expected effect of a sponge-city urban rainfall-runoff control target by the index decomposition method

Summary

Introduction

Under the influence of urbanization and climate change, urban areas have faced serious flood and waterlogging problems in recent years [1,2]. In China, on average 180 cities were flooded every year, and the number of waterlogged cities was 234 in 2013 and 258 in 2016. In response to the growing problem of urban waterlogging, the Chinese government launched the sponge city pilots in January 2015 [3]. 2016, and distributed in 28 provinces or municipalities directly under the central government [4]. The concept of the sponge city in China was significantly different from the concept put forward by scholars from Australia, which means a migratory population movement [5].

Methods

Results

Conclusion