<p>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| erosion control blanket]]).
Mats should be applied with soil fill technique:
<ol> <li>Grade the swale and smooth the top soil, removing any debris and large rocks, </li> <li>Seed with turf grass mixture, </li> <li>Dig 150 mm anchor trench at the top of the channel, </li> <li>Secure blanket into the trench with staples every 300 mm. Backfill and compact soil into the trench, </li> <li>Unroll mat in the direction of flow. Staple as recommended by manufacturer, </li> <li>Overlaps should be 150 mm and stapled. Upstream mat should always overlay the downstream mat, </li> <li>Anchor the bottom end of the channel in a similar fashion to the top, </li> <li>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, </li> <li>An [[Erosion control blankets| erosion control blanket]] may be applied to protect the surface through the first one or two years, </li> <li>Irrigate until turf grass is established. </li> </ol>