Erosion control

April 2007 » New & Noteworthy
Erosion control products
CE News Staff
Hard armor alternative
Profile Products LLC introduced its GreenArmor System as an alternative to hard armor such as rock riprap and concrete. The company combined Colbond’s Enkamat turf reinforcement mat (TRM) with Profile Product’s Flexterra flexible growth medium to create a system that the company says protects against elevated levels of hydraulic lift and shear forces on slopes and in channels, while encouraging fast turf establishment and long-term root reinforcement. Enkamat’s 3-D matrix of fused nylon filaments provides 95-percent open space to accept the hydraulically applied Flexterra infill and also acts as an anchor for root reinforcement. Flexterra, designed with thermally refined wood fibers, crimped interlocking fibers, and additives, provides immediate erosion control and requires no cure time. According to Profile Products, the GreenArmor system holds 15 times its weight in water, doubles the turf-establishment rates seen in common TRMs, and costs one-third to one-half as much as hard armor installations.
Profile Products LLC
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Grass ’pavement’ retains stormwater
Presto Products Company says its Geoblock porous pavement system—built with 1.64-foot-wide by 3.28-foot-long by 1.97-inch-deep, interlocking, high-strength blocks made from recycled plastic—provides vehicular and pedestrian load support over grass areas while protecting the grass from the harmful effects of traffic. With 87 percent open space, rain can percolate through the Geoblocks and into the ground rather than contribute to stormwater runoff. The system comprises four major components: the Geoblock unit, base support soil, selected topsoil infill, and selected vegetation. The company recommends as much as 4 inches of engineered base (a mix of coarse sand, crushed stone, and topsoil) for H-20 loading. Placing the Geoblock units in a staggered, bricklayer’s pattern maximizes the system’s load-distribution capability, according to Presto. Suggested applications include emergency and utility access lanes, including for heavy fire trucks; auxiliary parking areas; and pedestrian walkways, trails, and wheelchair access ways.
Presto Products Company
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Cotton-based erosion control
Mulch & Seed Innovations’ Cotton Fiber Matrix (CFM) cotton hydromulch was developed in cooperation with the U.S. Department of Agriculture (USDA) and Cotton Incorporated, a research and marketing company funded by U.S. growers of upland cotton. Made from a combination of cotton gin byproducts, straw, tackifiers, and additives, CFM is the industry’s first premium, cotton hydromulch that is rain ready for soil erosion control. CFM hydromulch creates a honeycomb seal over the soil, much like damp cotton gauze over an open wound, protecting the soil and seed from wind and heavy rain. According to Mulch & Seed Innovations, cotton’s porous, absorbent, and biodegradable nature helps CFM hydromulch establish seed faster and grow grass better than wood, paper, or erosion control blankets. In research conducted by the Department of Agronomy at Auburn University and the USDA Agricultural Research Station, CFM outperformed some competitive products by as much as 255 percent in soil loss and 189 percent in grass growth.
Mulch & Seed Innovations LLC
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Second-generation TRMs
Propex introduced the Landlok 300 second-generation TRM, a netless, patented matrix of pyramids formed with the company’s X3 fiber technology, which provides 40 percent greater surface area for trapping and protecting seed and soil and for capturing moisture. Landlok 300 is made from 100-percent synthetic and UV-stabilized components to provide permanent turf reinforcement on slopes and in stream channel and bank applications. According to Propex, the 3-D woven material offers superior tensile strength for loading and survivability requirements; provides greater flexibility to maintain contact with the subgrade, resulting in rapid seedling emergence and minimal soil loss; and is more cost effective than conventional erosion control methods such as rock riprap, concrete paving, or erosion control blankets. Landlok 300 is available in 8.5-foot-wide by 106-foot-long rolls.
Propex
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Flexible concrete mats
International Erosion Control Systems’ Cable Concrete incorporates flexible, stainless steel cable into high-strength concrete, segmented mats. Individual mats (4 feet by 16 feet) are available in weights of 20, 35, 45, and 70 pounds per square foot. A pre-attached, needle-punched geotextile allows moisture in the subsoil to drain between the concrete segments, preventing build up of hydraulic pressure beneath the concrete mat. The integrated cable distributes external forces throughout the system—for example, from maintenance vehicles—allows interlocking of mat sections by use of clamps, and provides a means to anchor the mats. According to the company, Cable Concrete will conform to any surface changes caused by freeze-thaw or other processes. Open space between the concrete segments allows natural vegetation growth over time, or it can be infilled with soil to below the top of the blocks and seeded. Applications include channel lining, bank protection, culvert outlet protection, and riverbed vehicle crossing areas.
International Erosion Control Systems
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Hydraulic mulch bonds with soil
Canfor’s EcoAegis bonded fiber matrix (BFM) hydraulic mulch contains refined wood fiber and a blended, hydrocolloid-based binder that the company says bonds directly to the soil. The biodegradable mulch, applied with conventional hydroseeding equipment with mechanical agitation, has a water-holding capacity of 10 times its own weight and is non-toxic to fish and wildlife. According to Canfor, independent tests show that EcoAegis BFM nearly matches or exceeds the performance of leading erosion control blankets in three areas—runoff reduction, soil retention, and seed germination.
Canfor Panel and Fibre
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Rice straw blankets
Earth Saver’s Greenfix family of erosion control blankets contains 100 percent rice straw or a blend of rice straw and coir fiber. According to the company, select rice straw fibers deliver a higher aerial density (cover factor) and extended performance compared with wheat and other agricultural fibers. Rice straw is a long, thin, flexible fiber that is naturally free of invasive weed species because of the aquatic environment in which it grows. Blankets are available with a natural, biodegradable containment matrix or photodegradable polypropylene netting in single- (top net) or double-net (top and bottom net) construction. Greenfix blankets are 7.5 feet wide and 108 feet long with a weight of 0.5 to 0.7 pounds per square yard.
Earth Saver Erosion Control Products
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