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Flexamat Erosion Control Gallery
Flexamat Levee Protection
This project was performed in conjunction with the US Army Corps of Engineers along with several state agencies. The armoring was required to be environmentally friendly, without any plastic components, and safe for wildlife, including endangered snakes inhabiting the site. Nearly 7 miles or 36,000 linear feet of the water side of levee was armored with Flexamat. Mats were unrolled from the the top of the levee to the toe, in continuous sections. The each mat had an overlapping extension for the next adjacent mat to be installed over, tying the entire system together. The contractor had 4, 4-person crews operating at the same time. Each crew installed 50,000 square feet per day, for a total of 200,000 square feet installed per workday. The vegetation seen in the video is all native growth, the site has not yet been seeded with the site specific seed mix. Flexamat will protect the levee during flood events, when it will be exposed to wave action and water flow.
Flexamat Plus UV-T was installed to armor two spillways and access roads at a massive, multi greenhouse complex in California. Originally, articulating concrete block mats interlocked with cable was specified but Flexamat Plus UV-T was value engineered as an alternative. Native growth is thriving within the Flexamat armor. The spillways have been overtopped and have held up like a champ! The access roads are actively used and are remain robust. Installed August of 2021.
Camp Ashland Levee Armoring
Flexamat was used to armor the Camp Ashland levee system along the Platte River. The US Army Corps of Engineers specified Flexamat to prevent erosion of the levee. The levee protects the Camp Ashland Army National Guard facility from flooding. The camp endured historic floods in 2015 and again in 2019. Water surged into classrooms, barracks and offices after the Platte River eroded the levee system. Flexamat is quickly unrolled using excavators. More info at www.Flexamat.com
Millbrook Dam Emergency Spillway
Built in the 1820s, the Millbrook Dam is a cultural landmark in the local Millbrook, Ontario community. Millbrook has had a mill since the community was founded, and was named as such because of the presence of a mill on a brook. Otonabee Regional Conservation Authority (ORCA), which owns the dam, needed to replace the dam because it was deemed unsafe. At 200 years old, there were concerns that a major rainfall could cause the dam to fail, and ultimately flood downtown Millbrook. The project involved engineering innovation to resolve foundation material and seepage challenge, while providing an optimized design for capacity. The 'As Low as Reasonably Practicable' (ALARP) principle was applied to develop a spillway hydraulic capacity solution and emergency embankment overflow that would be acceptable to the Ontario LRIA Dam Safety Guidelines. Flexamat was selected to armor the emergency embankment overflow. Flexamat would protect the earthen embankment during high flood events while aesthetically conforming with the historical site. The existing spillway was the only outlet for the river/pond. Care was taken during the dewatering to rescue and release over 800 fish, crayfish, turtles, frogs, and otters. Upon project completion, these species are all once again thriving. The pond remains an important resting area for geese and ducks. The reconstruction of the Millbrook Dam renewed confidence in the dam safety for residents of Millbrook as well as preserving the historical and social characteristics for the enjoyment of future generations.
Steep Slope Outlet Armoring
Tied Concrete Block Mattress was specified by West Virginia Division of Highways for outlet armoring on a section of roadway with a steep embankment. This was part of a rockfall mitigation project. Stormwater outlets discharge onto a steep 1:1 slope draining into the Tygart Valley River immediately below. Flexamat Plus rolls were manufactured to custom lengths to match the slope lengths. Earth percussion anchors were incorporated throughout the mat. Concrete was used to transition from the precast headwall to the Flexamat armor. Prior to installing the mat, the area was seeded with a site specific grass seed mix. Within the first growing season, the Flexamat armor will be covered in vegetation. www.Flexamat.com
Living Shoreline Solution
Oyster bags had previously been installed at this site, but they eventually fell apart. The eroded slope was re-graded to an approximate 2:1. The coverage with the tied concrete block mat was 120’x28’ – 3360 square feet. All the material was transported by barge over to the island and installed from land. 12 - 10’ x 28’ rolls of Flexamat 10NW with 2’ geogrid extension overlap system were unrolled down the slope, infilled with soil, and then planted with native slat marsh and salt tolerant species.
Helicopter transporting Flexamat rolls
Footage of a helicopter transporting Flexamat rolls to a remote area along the Snake River. The Flexamat concrete erosion mats were used to stop soil erosion along the Snake River in this remote area. The helicopter was used to transport materials and equipment because there are no roads in this area.
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