Abstract
The design and methods of installation of a prefabricated filter media for use with subsurface drains is presented. The filter media is fabricated from synthetic materials and can be used without special backfill. Methods of installing the prefabricated system in trenches and slopes are described. Results are presented from five field test installations containing a total length of 2,500 ft (762 m) of prefabricated underdrain. Costs for the underdrains are shown, and potential economies for slope stabilization and land drainage are indicated.
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