1. College of Water Sciences Beijing Normal Univ. Beijing 100875 China
2. Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education Beijing Normal Univ. Beijing 100875 China
3. Beijing Key Lab. of Urban Hydrological Cycle and Sponge City Technology Beijing Normal Univ. Beijing 100875 China
4. School of Engineering and the Built Environment Edinburgh Napier Univ. Edinburgh EH10 5DT UK
5. China Railway Fifth Survey and Design Institute Group Company Beijing 102600 China