FIELD: water-development works, drainage of agricultural lands. SUBSTANCE: drain includes drainage line made of flumes leant with edges against base covered by ground. Water intake holes formed either by perforation of edges of flumes or recesses in surface of base are made along joint of edges of flumes with surface of base. Drainage line is equipped with filter coming in the form of filtering material sprinkled in zone of water intake holes. EFFECT: diminished usage of filtering material, raised strength and reduced number of elements of drainage line. 2 cl, 4 dwg
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