Urban stormwater management based on an analysis of climate change: A case study of the Hebei and Guangdong provinces

Analysis of the urban climate changing is the basis for the implementation of stormwater management measures. This study analyzed the climate conditions of 230 cities in the Hebei and Guangdong provinces from 1958 to 2016, and then discussed stormwater management of these cities. The results demonstrated the following: (1) The climatic indicators differed significantly between the two provinces. These indicators include the aridity index, annual average potential evapotranspiration, precipitation, temperature, extreme precipitation frequency, precipitation intensity, drought frequency, and drought intensity of 146 cities in Hebei and 84 cities in Guangdong. (2) With the exception of temperature and potential evapotranspiration, most of the above indicators showed a non-significant trend (at the significance level of 5%) in the past 59 years. Temperature of most cities in the two provinces had a significant upward trend, and the potential evapotranspiration of most cities had a significant downward trend. (3) According to the above analysis, we constructed a system to evaluate the flooding and drought risk for these cities, and the evaluation indicated that all cities of Guangdong had a high flooding risk and approximately one-fifth cities of Hebei had a high drought risk. Finally, we divided 230 cities into five types based on the above risk analysis, and proposed stormwater management strategies for each type of city based on Low Impact Development (LID).