Meeting the Requirements
The geotextile dewatering tube must meet or exceed those requirements shown in the table below. It shall be composed of high-tenacity polypropylene (PP) yarns, which are woven into a network in such a manner that the yarns retain their relative position to each other for the high demands required in geotextile tube applications in the United States, Bahamas, Caribbean such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada and Guadeloupe,.
Wide Tensile Strength
(Operating strength in the tube’s
circumferential direction after seaming)
Base Fabric: ASTM
Wide Width Tensile Strength
(Operating Strength in the tube’s
axial direction after seaming)
Base Fabric: ASTM
Seam: ASTM D4884
|Apparent Opening Size (AOS)
|UV Resistance (at 500 hrs)
Preparating the Site
Inspect the area where the dewatering cell will be built. The site needs to be level in all directions (no slope across the width of the tube and maximum of .5% in the direction of the tubes length) and all obstructions removed to avoid damaging the geotextile tubes (such as roots and projecting stones).
Construct a trench inside the perimeter of the cell to control the flow of the effluent away from the dewatering tubes to a sump or a gravity discharge location (flume).
Build a perimeter containment berm around the cell to contain any potential release of sludge or effluent into the surrounding environment.
Level the base of the cell and install an impermeable membrane should be installed over the entire floor of the cell and the berm, then embed in the surrounding soil outside the berm. Optionally, if the terrain is already leveled, the exterior berm could be constructed using sand bags, concrete highway barriers, railroad crossties, or hay bales.
Then the cell shall be lined with an impermeable membrane.
After installing the membrane, a non-woven geotextile may be installed over the entire surface to protect the membrane against heavy machinery traffic.
Cover the floor of the cell with some type of drainage media such as a layer of drainage stone or drainage net to improve the flow of the effluent from underneath dewatering tubes container to the interior trench.