Designing for Flow

by Robert M. Koerner, (M.ASCE), Prof. of Civ. Engrg.; Drexel University, Philadelphia, PA,

Serial Information: Civil Engineering—ASCE, 1986, Vol. 56, Issue 10, Pg. 60-62

Document Type: Feature article


Geotextiles used for in-plane drainage can carry surprisingly large amounts of water within their structures. These composite drains, known as sheet drains, prefabricated drainage composites or drainage geocomposites, must be selected to produce the required flow rate at the particular hydraulic gradient and externally applied pressure. Tests on their hydraulic behavior have resulted in a series of flow charts that can be used as design guidelines. Properties of various composites available on the market are included.

Subject Headings: Drainage | Composite materials | Hydraulic design | Geosynthetics | Hydraulic structures | Prefabrication | Flow rates | Hydraulic gradients

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