ABSTRACT
This paper firstly describes the flow process of leaked water from sewers or drains by use of unsaturated-saturated flow theory and idealizes the process into four stages. Then, simple new analytical solutions for the first three stages were reviewed or derived. Emphasis was put on derivations of analytical solution for estimating the rise of groundwater level after water escaping on the sloping surface. Lastly, a case study is conducted on a typical fill slope in Hong Kong to show how to use the derived solutions.
