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EROSION & SEDIMENT CONTROL PROJECT PROFILE Mankota Low Level Crossing EnviroGrid eliminates the need for annual road and culvert washout repairs and traffic interruptions. LOCATION: Mankota, Saskatchewan PRODUCTS: EnviroGrid cellular confinement system Woven geotextile PROJECT PARTNERS: Owner and Contractor Regional Municipality of Mankota Completion Date: October 2015 Managing the impacts of spring runoff in Saskatchewan is tough. It can make an infrastructure manager feel like Bill Murray in Groundhog Day; the same problems over and over again. Like Bill, the RM of Mankota decided it was time for a change, and approached Nilex to explore their options. Challenge When spring runoff comes, it comes with a vengance. Dry streambeds fill rapidly and flows can quickly overwhelm even well-set culverts. Once a culvert reaches capacity, the water only has one place to go: Across the road above. This heavy flow, across a surface built on a round culvert, evenutally causes the road material and culvert to shift, or “wash-out.” Spring also brings heavy rains which create the same problems as the flows from snow thaw. For years, repair from washouts was a standard budget item for the municipality, much as it was an accepted reality for drivers who worked their way around repairs. As frustrating as these annual rituals were, the concept of a culvert-free “low level crossing” design was something new to the municipality and its constituents. Solution EnviroGrid cellular confinement is central to low level crossing design. It’s manufactured from rugged High Density Polyethylene which is UVresistant and designed to confine a variety of fill materials. Instead of water running under the road via culverts, low level crossing design uses the increased strength of the confined aggregate in the cell network to allow the water to pass over the road during high flows without damage to the surface. The material’s tensile strength, pinned to the subgrade, holds the road in place. Mankota Low Level Crossing Lake Wabamun Shoreline Protection In extreme high flows, some aggregate may still be washed aside, but that represents a much easier and cheaper repair than culvert replacement. The work also helped shrink the RM’s environmental impact by reducing repair equipment carbon emissions and reducing the amount of native gravel and aggregate material excavated to accomodate annual repairs. The Nilex Advantage Installation The EnviroGrid arrives on site in a compact flattened state that makes it easy to carry and place. Once the damaged culvert was removed and the ground leveled, geotextile was laid to cover the project area. The EnviroGrid was staked to the subgrade and stretched to expand the cells to their designed size. Tendons in the material contribute to system strength by creating solid fastening locations that conform to ground contours, offering higher levels of protection against flows. Aggregate was then poured by a bucket loader to fill all the cells, and overtopped to create a level surface. Once complete, the RM returned the area to its desired elevation using the existing fill material available on site. Nilex is committed to unearthing better results. Whether it’s for a civil, resource or environmental project, we offer the latest engineered and technically-superior materials and techniques to save our customers time and money, minimize the need to move or remove earth, and reduce the need for granular materials. With over 38 years of experience, a longstanding commitment to the environment and highly qualified staff, Nilex delivers the products and technologies that give clients an economic advantage with environmental benefit. Results EnviroGrid gave the RM of Mankota a solution that was economical and eliminated the need for costly and repetitive gravel hauls and repairs. nilex.com Rev. 05/2016