1. Environment, Transport and Works Bureau (ETWB): Code of Practice on Monitoring and Maintenance of Water-carrying Services affecting Slopes, 2nd edn. ETWB, Hong Kong (2006)
2. Hui, T.H.H., Tam, S.M., Sun, H.W.: Review of Incidents Involving Slopes Affected by Leakage of Water-Carrying Services (GEO Report No. 203). Geotechnical Engineering Office, Hong Kong (2007)
3. Water Supplies Department (WSD): Manual of Mainlaying Practice. WSD, Hong Kong (2012)
4. Zhang, L.M., Li, J.H.: Determining the Safe Distance between Ductile Iron Gas Pipes and Sewage Main. The Hong Kong University of Science and Technology, Hong Kong (2007)