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]]).   

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,

#Grade the swale and smooth the top soil, removing any debris and large rocks,

**Seed with turf mixture,

#Seed with [[turf]] grass mixture,

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

#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.

#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.

#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.

#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,  

#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. 

#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.

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

**Irrigate until turf grass is established.  

#Irrigate until turf grass is established.

 

[[category: materials]]

[[category: materials]]