Zeigler, E.R.. 1978. "Hydraulic Laboratory Manning "n" and Grade Deviation Study for 4-inch-diameter, Nonperforated, Corrugated Plastic Drain Tubing". Bureau of Reclamation, Report Number REC-ERC-78-02.
Abstract:
Web Link:
http://www.usbr.gov/pmts/hydraulics_lab/pubs/REC/REC-ERC-78-02.pdf
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