Landlok Turf Reinforcement Mat for Coulthards Creek upgrade

Project Snapshot

Queensland’s Moreton Bay Regional Council (MBRC) proposed to undertake works for the upgrade of Coulthards Creek between Leitchs Road and the North Coast railway line, which comprises a combination of concrete lined channel and open floodway.

A culvert upgrade including the reconstruction of an existing bikeway required protection of the new embankment from erosion during periods of overtopping.

The Solution

The low-lying Coulthards Creek area is commonly sodden and difficult to maintain. To ensure the protection of people and property from the impacts of flooding to improve maintainability, MBRC proposes to undertake works that include:

• constructing a new wider concrete channel

• earthworks to re-profile the drainage area

• raising the existing bikeway

• replacing the existing low-level culverts, and

• providing scour protection.

The solution involved modifying the Coulthards creek channel to include a low-flow invert including control of the erosion adjacent to the concrete invert. Council was looking for an economical, environmentally compatible yet technical solution. At the same time, they were looking for a vegetated surface in the treated areas.

Due to a recurring issue of scour adjacent to low-flow channels in the area it was recommended that a combination of erosion control and turf reinforcing be used directly adjacent to limit the potential for this to occur.

To achieve a suitable solution, the Consultant investigated various options and Propex Landlok 450® Turf Reinforcement Mat was selected as the most technically compliant yet economical solution.

The Result

To determine the performance of this system, several standard tests were reviewed.

This erosion control system can withstand high velocities and associated high tractive shear stresses in open channels and is more economical than other traditional methods such as concrete and using rocks or rock mattresses.

The presence of this system ensures erosion protection – even in times of drought or reduced vegetation – remains in place to enhance the vegetation and root reinforcement of the established plant growth over long time periods.

Find out more about Landlok 450®

Landlok 450® Turf Reinforcement Mat provides an immediate and long term erosion control solution for steep slopes. Using patented X3® fibre technology, a Landlok® turf reinforcement mat traps more seed, soil and water in place than traditional hard armour products, yielding faster and fuller vegetation.