DRAINAGE & FILTRATION

Drainage and filtration are primary functions of all geotextiles. These porous fabrics allow water to pass through them and away from an area while retaining or filtering out sediments. They can be used alone or in conjunction with other products to enhance a traditional granular filter system or completely replace it altogether. However, in order for a drainage structure to be effective it must be properly designed to match the dynamic hydraulic and soil conditions of the area in which it is being used.

In the late 1970’s the Army Corps of Engineers established guidelines for the use of geotextiles as filters and from there it became an accepted practice by transportation authorities and engineering communities. The permeability of the geotextile fabrics must be greater than the permeability of the soil to allow the passage of water at high rates.  It must also retain soil particles without clogging and be strong enough to survive construction without damage.  

Need help choosing a geotextile or geosynthetic product? Please contact us at  609-971-8810. We welcome the opportunity to answer your questions and assist you in selecting the right geotextile for your next project.

Drainage and filtration are primary functions of all geotextiles. These porous fabrics allow water to pass through them and away from an area while retaining or filtering out sediments. They can be used alone or in conjunction with other products to enhance a traditional granular filter system or completely replace it altogether. However, in order for a drainage structure to be effective it must be properly designed to match the dynamic hydraulic and soil conditions of the area in which it is being used.

In the late 1970’s the Army Corps of Engineers established guidelines for the use of geotextiles as filters and from there it became an accepted practice by transportation authorities and engineering communities. The permeability of the geotextile fabrics must be greater than the permeability of the soil to allow the passage of water at high rates.  It must also retain soil particles without clogging and be strong enough to survive construction without damage.  

Need help choosing a geotextile or geosynthetic product? Please contact us at  609-971-8810. We welcome the opportunity to answer your questions and assist you in selecting the right geotextile for your next project.

PRODUCTS WE USE IN THESE APPLICATIONS:

Underdrains / Subsurface Drainage

A drainage system can be constructed along the edge of a roadway or embankment by simply lining a gravel-filled trench with a lightweight nonwoven geotextile. More complex drainage systems can utilize prefabricated geocomposite drains and/or a network of buried pipe wrapped in filter socks.  Typical applications include airfields, athletic fields, landfill leachate collection systems or to keep water away from critical structures.  The use of an underdrain system can significantly extend the performance and service life of a roadway or structure.

Permanent Erosion Control & Scour Protection

Permanent erosion control systems are constructed to provide wave protection for shoreline embankments and causeways along with scour protection of drainage structures, ditches, bridge piers and abutments.  Woven monofilament geotextiles make an ideal synthetic filter for these systems due to the uniform and measurable openings in the fabric.  They are also capable of withstanding the construction of the system without damage.  They can be used with traditional rip-rap or modern geosynthetics such as geotextile tubes and geocells as well as gabion and reno mattresses.  In addition, vegetating or covering these systems maintains the natural beauty of the area.

Dewatering Filter Bags & Tubes

Dewatering filter bags and tubes are effective at collecting sediments from wastewater ponds, lagoons, construction and dredging project sites. Whether they are a custom or stock size, they can be utilized for any size project.  Filter fabric selection is based upon the type of sediments encountered.

The sediment-laden water is pumped into the fill port and filtered through the geotextile fabric.  The filtered water can be collected and further polished or discharged back into an acceptable location.  The material retained within the bag or tube can be easily removed for off-site disposal or reused on the site.  Dewatering filter bags are a cost-effective and environmentally friendly method of drainage and filtration of collected silt and sediment before it reaches our waterways.

PROJECT HIGHLIGHT

Project:  Northern States Power Superfund Site / Ashland, Wisconsin
Contractor: Envirocon, Inc

When Envirocon needed custom dewatering bags at their Ashland, Wisconsin site they called IWT Cargo-Guard. After analyzing their
specific project requirements such as flow and sieve size, we determined a custom high flow filter bag would be required. To maximize the flow without binding, we placed the inlet port on top of the dewatering bags. In addition, we added an impermeable neck to cut down on leaking. To allow the bags to be lifted we added support lifting straps and corner loops to help secure the bags in place.

dewatering bags for silt

When Envirocon needed custom dewatering bags at their Ashland, Wisconsin site they called IWT Cargo-Guard. After analyzing their
specific project requirements such as flow and sieve size, we determined a custom high flow filter bag would be required. To maximize the flow without binding, we placed the inlet port on top of the dewatering bags. In addition, we added an impermeable neck to cut down on leaking. To allow the bags to be lifted we added support lifting straps and corner loops to help secure the bags in place.

dewatering bags for silt
dewatering bags for silt

“The dewatering bags are well constructed and exceeded our expectations in removal efficiency as well as strength under pressure. IWT Cargo-Guard customer service is top of the line, from the first call to follow up conversations. They were willing to customize features on the bag such as neck length or position, or the need to add additional reinforcements. You can feel the sense of pride they have in their product and relationships with customers.”

Bryce Ottman – Site Engineer  Envirocon, Inc

“The dewatering bags are well constructed and exceeded our expectations in removal efficiency as well as strength under pressure. IWT Cargo-Guard customer service is top of the line, from the first call to follow up conversations. They were willing to customize features on the bag such as neck length or position, or the need to add additional reinforcements. You can feel the sense of pride they have in their product and relationships with customers.”

Bryce Ottman – Site Engineer  Envirocon, Inc

dewatering bags for silt

At IWT Cargo-Guard, one size fits all is not our motto.  Different sites have requirements that are unique to the type sediment and specific requirements of the project.  Call us at 609-971-8810 so we can help design a custom dewatering filter bag for your next project.

dewatering bags

At IWT Cargo-Guard, one size fits all is not our motto.  Different sites have requirements that are unique to the type sediment and specific requirements of the project.  Call us at 609-971-8810 so we can help design a custom dewatering filter bag for your next project.

dewatering bags

Disclaimer: These guidelines are for informational purposes only and are intended as illustration or general information only and are not intended as a guarantee or warranty. IWT assumes no responsibilities in connection with the use of this information.