Corrugated drainage tube with restraining screen

摘要: Flexible corrugated drainage tube comprises alternating annular peaks and valleys with walls interconnecting valleys. Plurality of openings in selected are arranged transversely to longitudinal axis so that liquid water can drain into through openings. Water permeable restraining screen surrounds engages thereof for waterborne particles above predetermined size range from entering when drains allows silt clay pass therethrough which prevents becoming blinded these particles.