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Turf reinforcement mats (TRM) may be required in swales which are designed to convey higher velocity events. Most TRM are made of synthetic fibres and intended as a permanent part of the construction (unlike a temporary [[Erosion control blankets|
ECB]]). *Mats should be applied with soil fill technique: **Grade the swale and smooth the top soil, removing any debris and large rocks, **Seed with turf grass mixture, **Dig 150 mm anchor trench at the top of the channel, **Secure blanket into the trench with staples every 300 mm. Backfill and compact soil into the trench, **Unroll mat in the direction of flow. Staple as recommended by manufacturer, **Overlaps should be 150 mm and stapled. Upstream mat should always overlay the downstream mat, **Anchor the bottom end of the channel in a similar fashion to the top, **Apply 15-20 mm of topsoil over the TRM, without the use of heavy machinery which can tear the mat and/or compact the soil, **An [[Erosion control blankets| ECB]] may be applied to protect the surface through the first one or two years, **Irrigate until turf grass is established.