Changes

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]]).   

<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:

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,

<li>Grade the swale and smooth the top soil, removing any debris and large rocks,</li>

**Dig 150 mm anchor trench at the top of the channel,  

<li>Seed with turf grass mixture,</li>

**Secure blanket into the trench with staples every 300 mm. Backfill and compact soil into the trench,

<li>Dig 150 mm anchor trench at the top of the channel,</li>

**Unroll mat in the direction of flow. Staple as recommended by manufacturer,  

<li>Secure blanket into the trench with staples every 300 mm. Backfill and compact soil into the trench,</li>

**Overlaps should be 150 mm and stapled. Upstream mat should always overlay the downstream mat,  

<li>Unroll mat in the direction of flow. Staple as recommended by manufacturer,</li>

**Anchor the bottom end of the channel in a similar fashion to the top,  

<li>Overlaps should be 150 mm and stapled. Upstream mat should always overlay the downstream mat, </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>Anchor the bottom end of the channel in a similar fashion to the top, </li>

**An [[Erosion control blankets|ECB]]  may be applied to protect the surface through the first one or two years,  

<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>

**Irrigate until turf grass is established.  

<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>

[[category: materials]]

[[category: materials]]