This page contains a Flash digital edition of a book. Managing & Maintaining our water channels

Typical surface water channel

erosion damage with unreinforced soil at Calverton Notts

Calverton, installing erosion control matting

Design solutions and system integration

“Use of poor quality or poor

sustainability materials is another frequent cause of premature failure”

As well as performance tested products and systems, perhaps the most critical element of successful bio-engineered erosion control is design of a solution appropriate to the application.

“Each situation has different characteristics,” states David Holland, “and the designer has to be aware of how all the parameters interact, so that they work together. This includes understanding how the system is fastened down to the slope to create a permanent erosion control feature, and how to specify where different types of vegetation are best sited to provide the appropriate control.”

“I see many schemes where remedial work is required, for example where the toe is poorly anchored with the wrong materials or placed insufficiently deep so that it is subject to scour. Often they have to be stripped out and replaced. Just grabbing netting off the shelf, throwing over topsoil and seeding it will not provide a stable surface which will resist the sort of rain we’ve had this summer.”

Use of poor quality or poor sustainability materials is another frequent cause of premature failure. Heavy duty measures such as rock rolls used to stabilise toed-in erosion matting should have aggregate mixtures sized to encourage invertebrate establishment; and coir matting provides welcome protection for establishment of reedbeds and other emergent waterside plants. Staking with untreated chestnut stakes provides long term stability with the strength to preventing movement of the different elements of the design solution.

Meeting development planning requirements

Typical of the problems encountered in private development, was a project on the River Gwenfro, a small watercourse backing onto the gardens of a housing development in Wrexham, North Wales. The bank at the bottom of the gardens was being scoured away when the stream was in flood.

Natural vegetation inherently provides good soil erosion protection, and at a fraction of the cost – less than a third – of the installed cost of rock or concrete. But to help it get properly established, turn to Tensar Technology.

Tensar’s RollMax™ range includes VMax® Composite Turf Reinforcement Mats, designed to reinforce vegetation through to maturity and providing permanent protection instantly for stream banks, shorelines, severe slopes and in high to extreme flow channels. Not to mention protecting your budgets.

Contact our technical team now to see how Tensar has the answer.

Natural soil protection that won’t erode your budget?

Talk to our technical team on:+44 (0)1254 266862


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