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This is a horizontal drain resolving problems of existing drainage methods. It is constructed by directly inserting PVD to water channels of WHD so it prevents the loss of pore water and improves the water collection rate by more than three-fold. Since water channels with over 50% of a contact area has an excellent load dispersion effect, it maintains excellent drainage performance of a minimum of 3,500cm3 under 500kPa overburden load. Therefore, it has excellent water collection and drainage capability for pore water delivered from many PVDs. - A new horizontal drainage method maximizing water collection and drainage efficiency by directly inserting and connecting PVD to a water channel of a horizontal drain - Excellent economic feasibility that can reduce the cost of construction more than 30% compared to sand/aggregate drainage layers - Core structure with an outstanding load dispersion effect with over 50% of a contact area