This study was performed to evaluate the general specifications of the vertical drain for a ground improvement project in the Taipei :MRT system. Concerning the in-situ condition, the major performancerelated properties reviewed in this paper are clogging resistance of filter geotextiles and the flow rate of the drains. Six types of vertical drain were collected for the testing program and a clayey soil sample was obtained for the performance test. The iµ)w rate of drains was determined under the controllable hydrostatic confinement condition. It was found that the flow rate was to be influenced by the period and the level of confining pressure applied. 3-days is the minimum testing period recommended to meet these specifications. Findings are provided for further consideration of this typical project. To ensure the flow rates of the various drains are acceptable for the job, the required flow capacity calculated from the consolidation process was also studied and analyzed in this paper.
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