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CN-12-201-287 Klamath Project - Oregon-California. Experimental Line in Unit 71. Close-up view of corrugated plastic tubing with porous membrane around it. One thousand feet of this type of tubing was placed experimentally at the north end of Unit No. 71. No cinder envelope was placed around this type of pipe. Note: This tubing was placed at no expense to the United States. The tubing was supplied by Advance Drainage Products and the contractor placed the tubing at his own expense; February 1973; Bureau of Reclamation photo by D. W. Stein

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