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156th Street Outfall Protection

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Introduction Challenge Solution Installation Results Gallery The Nilex Advantage

Long-term erosion control protection.

Heritage Valley, located in southwest Edmonton, consists of several new subdivisions with a network of stormwater management ponds.

Location

Edmonton, Alberta

Project Partners

Owner: City of Edmonton
Consultant: Stantec Consulting
Contractor: Eng-Con Holdings Ltd.
Completion Date: June 2011

Challenge

The City of Edmonton was constructing a new outfall at 156 Street to allow drainage of a stormwater management pond, located within the Heritage Valley area, to Blackmud Creek. The soil around the construction area was soft, consisting of sandy/silty material.

The City was looking for a solution that would provide strength to the drainage channel, handle high flow water velocities, and allow for immediate vegetation establishment.

Solution

Nilex recommended a permanent erosion control system that consisted of topsoil hydroseeding, turf reinforcement mats (TRM), soft revetment mats, and permeable check dams to provide continuous erosion protection and vegetation establishment.

The system was designed with the following products: North American Green’s (NAG) Vmax C350 TRM, a high performance coconut mat that is reinforced with a permanent, non-degradable, three-dimensional matting structure. This product enables vegetation establishment and is intended for use in areas where forces exerted by water and/or wind exceed the shear limits of unreinforced vegetation.

NAG ShoreMax, a soft revetment scour protection mat that has been designed as a mechanical protection to be used in conjunction with other erosion control products and provides protection against much higher shear stresses and velocities than TRMs alone.

ShoreMax is a highly flexible, UV stabilized rubber mat that contains voids to allow vegetation establishment through the mat or natural in-filling of sediment.

Nilex GeoRidge Bio, a permeable check dam that acts as an energy dissipater, reducing water velocity by spreading it over a wider area and trapping sediment.

The combination of these products allowed for direct contact with the soil and the initial layer of hydroseed to prevent erosion of the soil and seed, aid in vegetation establishment, and provide longterm protection to the channel. The flexibility of the products allowed for them to easily conform to the concave nature of the channel.

Installation

The system was installed over a period of two days, utilizing a crew of eight people. First, the soft silty material in the channel was removed and replaced with clay. The area was reshaped and freshly topsoiled and hydroseeded. The Vmax C350 TRM was installed over this area carefully so as not to disturb the fresh soil and seed. The ShoreMax panels were then installed over the TRM and secured in place with 18” rebar staples. As a final support to the system, Nilex’s GeoRidge Bio was installed along the channel, further reducing the water flow velocities and allow for the new seed to establish. GeoRidge Bio has been designed to break down over a period of 18 to 24 months, eliminating the need to remove after vegetation establishment.

Results

This erosion control system provided a stable channel, while providing erosion and sediment control. Within four weeks, vegetation was already established and by 12 weeks, the channel was fully vegetated. This system provided the City of Edmonton with and immediate solution that was cost effective and easy to install, and did not require the use of natural resources such as rock riprap. By installing ShoreMax and the Vmax C350 TRM, the City will also see a reduction in life-cycle costs as this is a permanent solution that will require little maintenance.

Gallery

The Nilex Advantage

Nilex is committed to unearthing better results. Whether it’s for a civil, resource or environmental project, we offer the latest engineered and technically superior materials and techniques to save our customers time and money, and minimize the need to move or remove earth, and reduce the need for granular materials.

With over 35 years experience, a long-standing commitment to the environment and highly qualified staff, Nilex delivers the products and technologies that give clients an economic advantage with environmental benefit.

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