| Abstract | In a review completed recently by the Geotechnical Engineering Office, information was gathered on horizontal drains installed at 87 sites in Hong Kong, of which eight cases were selected for detailed assessment. Analysis of piezometric and drain discharge data shows that the drains at the eight selected sites have caused significant lowering of main groundwater levels; also that clogging of drains does not appear to be a major concern for the logner-term. In this article, various investigation, design and construction aspects are discussed, including the use of different drain types and materials, grouting of drain inverts, contractual arrangements and installation costs. Recommendations are given for good practice in monitoring and maintenance. |
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