This study focuses on identifying and evaluating critical parameters of various drainage configurations, arrangement, and filter which\naffect the efficiency of water draining system in slopes. There are a total of seven experiments with different types of homogeneous soil,\ndrainage envelope, filter material, and quantity of pipes performed utilizing a model box with a dimension of 0.8mÃ?â?? 0.8mÃ?â?? 0.6 m.The\npipes were orientated at 5 degrees from the horizontal. Rainfall event was introduced via a rainfall simulator with rainfall intensity of\n434.1 mm/h. From the experiments performed, the expected outcomes when utilizing double pipes and geotextile as envelope filter\nwere verified in this study. The results obtained from these experiments were reviewed and compared with Chapter 14 ââ?¬Å?Subsurface\nDrainage Systemsââ?¬Â of DIDââ?¬â?¢s Irrigation and Agricultural Drainage Manual of Malaysia and the European standard. It is recommended\nthat the pipe installed in the slope could be wrapped with geotextile and in tandem with application of granular filter to minimize\nclogging without affecting the water discharge rate. Terzaghiââ?¬â?¢s filter criteria could be followed closely when deciding on new\nmaterials to act as aggregate filter. A caging system could be introduced as it could maintain the integrity of the drainage system and\ncould ease installation
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