GeoTextile Tubes Specs

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 Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida and most of Central America and South America.

Physical Property Test Method Units Value
Wide Tensile Strength
(Operating strength in the tube's
circumferential direction after seaming)
Base Fabric: ASTM
D4595
Seam: ASTM-D4884
kN/m
(lbs/in)
70 (400)
Wide Width Tensile Strength
(Operating Strength in the tube's
axial direction after seaming)
Base Fabric: ASTM
D4595
Seam: ASTM D4884
kN/m
(lbs/in)
52 (300)
Apparent Opening Size (AOS) ASTM D4751 mm (US
sieve)
0.425 (40)
Flow Rate ASTM D4491 l/min/m2
(gal/min/ft2)
817 (20)
UV Resistance (at 500 hrs) ASTM D4355 % 80
Mass/Unit Area ASTM D5261 g/m1
(oz/sy)
n/a

Receiving & Storing GeoTextile Tubes or Bags

All dewatering geotextile tubes come packaged in heavy plastic and are clearly labeled.  Geotextile tubes need to be kept in their original packing until ready for use.  Do not unload tubes with hooks tongs or other sharp objects, and do not drag them along the ground. Dewatering tubes should always be stored in a safe, elevated, location away from accumulated water, and protected from conditions that will affect the properties or performance of the container.  Do not expose to very high temperatures (in excess of 180º C / 356º F).  When unwrapped for use,  avoid cutting geotextile tube and keep original tube identification information for future use.

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.