Erosion & Sediment Control

Erosion & Sediment Control

KEYMAY provides woven, non-woven and wire-backed sediment control solutions and a wide range of erosion control products suited for everything from ultra-short term to permanent use. KEYMAY’s experienced installation crews are available to safely and efficiently execute the procurement, delivery and installation process using the highest in industry-approved methods.

Erosion Control Blankets


Types of Water Erosion

The effects of prolonged rainfall are the prime cause of water-induced soil erosion, and can cause escalating effects. This water-induced erosion can be separated into four categories:

Raindrop Erosion

Raindrop erosion is caused by the effect of falling raindrops on soil. Prolonged rainfall dislodges the soil particles and results in erosion over time, causing soil runoff. Raindrop erosion often causes uneven ground effects that fluctuate in different areas and types of sediment.

Sheet Erosion

When rainfall or other waterfall moves in broad, even strokes across a large span of land over a prolonged period of time, sheet erosion occurs. With sheet erosion, the top layer of sediment is stripped and often dislodged and/or lost in runoff. This results in more evenly distributed sediment loss that will need to be replaced and compacted.

Rill and Gully Erosion

If rainfall or other water runoff is concentrated in rivulets or grooves, it results in ‘rill and gully erosion’. The grooves created by this prolonged runoff are called ‘rills’, and can end up eroding several inches down into the surface of the soil.

Stream and Channel Erosion

Significant erosion through deep and sometimes wide rivets is referred to as ‘stream’ or ‘channel’ erosion. When there is significant rainfall in an area, or a new water flow is unleashed, these streams can be created, dislodging significant amounts of soil and sediment.


Erosion Control Solutions

KEYMAY offers a wide variety of erosion control solutions to fit every application. KEYMAY is a leading supplier of erosion control products, and has the knowledge and experience on-site to ensure proper installation procedure for optimal coverage and support.

Erosion Control Blankets

KEYMAY provides premium Erosion Control Blankets (ECBs) for a variety of applications. ECBs are often used to protect slopes from rain fall and other water flows, preventing excessive sediment loss and sediment relocation. Over time, soil particles are very susceptible to being dislodged and carried away, causing concentrated streams, rills, and gullies to develop. As this occurs, the integrity of the slope is diminished and can begin to affect the integrity of the structure, posing environmental and safety concerns.

ECBs are commonly used to protect channel walls and large slopes against water flows. Depending on the power and frequency of the water flows, whether the channel experiences fluctuating levels and velocities of runoff due to storm water flows, etc., durable protection is required to avoid significant damage to the channel walls, which could pose a risk to the entire channel or slope system. GeoCell is often used in channel erosion prevention, installed in the channel floor and walls and infilled with a material best suited for the flow of the specific channel and environment.

channel wall protection

secure body of blanket diagram

Erosion Control Installation Process

Proper installation of erosion control projects is integral to the performance of the control measures. KEYMAY’s installation crews are trained and experienced in a wide variety of applications and environments, adaptable to even the steepest slopes and complex terrain. KEYMAY’s installation team follows proper procedure on every installation job and will ensure the erosion control materials are installed correctly for optimal durability and longevity.

When installing erosion control materials, you must first prepare the site, grading the area for proper slope conditions, and scoured for weeds, stones, large roots, etc. that could compromise the application and performance of the erosion control materials. Any present voids in the soil must be filled and compacted to ensure proper coverage and material longevity. Following each step of the procedure, and reviewing for quality control at each stage of the process is essential to maximum erosion control and protection.


Silt Fence Sediment Control


Silt fence is a temporary barrier solution allowing water to pool creating a low energy condition. Sediment will be retained behind the fence preventing it from being deposited in water bodies or storm sewers. The silt fence is composed of a filter fabric entrenched in the soil and secured to a series of posts for support. While this solution is used as a preventative measure against excessive sediment loss, it is designed as a temporary barrier and is not effective as a long-term sediment control solution.

KEYMAY’s silt fence solutions are constructed from a lightweight, woven geotextile material. With proper design and installation practices, silt fence maximum sediment retention prior to maintenance will be 200mm or ” of the height of the fence.

Considerations for Proper Silt Fence Design and Installation
  • Do not install in or across defined drainage ditches or watercourses for flow or sediment control.
  • May not be an appropriate practice where proper configuration and installation can be achieved, including very shallow, compacted, rocky, frozen, saturated and or heavily rooted soils.
  • Silt fence will contain large silt and sand particles, however small clay particles will pass through materials. Source control is the only definitive way to prevent mobilization of clay particles.
Failure Risks Due to Incorrect Silt Fence Installation

Silt fence sediment control structures can cause a lot of damage to your project if improperly designed and incorrectly installed. This can severely impact your timeline and budget, not to mention, may cause significant physical damage to your construction site due to ineffective solutions. Incorrect installation or site preparation can include the following problems:

  • Improper placement and installation on-site
  • Water flow too great for installed silt fence structure
  • Shallow trenches with little or no soil compaction
  • Inadequate attachment to posts
  • Ineffective maintenance of silt fence after installation

Silt Fence Installation

KEYMAY’s installation crews are expertly trained and will ensure your silt fence is designed and installed according to the highest industry standards. Our team will undergo a thorough review of the site area, and develop a silt fence solution best suited to your needs.

KEYMAY’s silt fence installation crews compact the site prior to installing posts to provide the most secure building ground. Installation crews will then ensure accurate and secure post placement as outlined in the project plan, driving posts a minimum of 500mm (1.65″) into the ground. KEYMAY’s installation team always follows industry best practice and procedure to assure proper geotextile splicing when required during the construction process, ensuring proper overlapping installation to maintain the integrity of the barrier.

Once installed, the silt fence should be inspected after each rainfall and daily throughout prolonged periods of significant rainfall to maintain continued effective drainage.

Trench Construction

When installing a silt fence in a trench, the geotextile material is installed in a ‘J’ shape at least 150 mm (6 inches) below the ground, following the contours of the site for effective protection from water flow. The trench is then backfilled and compacted over the installed geotextile until the trench is completely filled with compacted soil.

Soil Slicing Construction

Another method of silt fence installation is through soil slicing. With soil slicing silt fence construction, the geotextile material is inserted into a slit in the soil, about 0.2 to 0.3 m (8 to 12in.) deep. The silt fence is installed deep enough so that no water flow will pass under the material, while allowing effective disruption to the soil above the silt fence structure in order to create an optimal soil condition for mechanical compaction upon completion.

trench-construction-graph
soil-slicing-construction-graph

Enviro-Ridge Ditch Barrier


Enviro-Ridge is one of the leading products for sediment control in ditch channels. Enviro-Ridge’s patented design is low-profile and lightweight, constructed of permeable plastic, making it flexible and very easy to use and install on-site. The flexible structure makes it very adaptable to various types of terrain, allowing it to conform to uneven ground and varying ditch shapes. This adaptable fit makes it one of the best solutions on the market when used in conjunction with Erosion Control Blankets (ECBs).

Enviro-Ridge is constructed as a permeable structure, designed to slow water to promote sedimentation. The Enviro-Ridge product will help persuade sediment settlement towards the upslope side of each berm by managing flow velocity in that area.

Enviro-Ridge Installation Process

The Enviro-Ridge ditch barriers are installed as a series of berms starting at the toe of the backslope or sideslope, and gradually extending up the slope following the edge of ditch or channel. The Enviro-Ridge structures help mitigate the effects of water erosion and the resulting flow of sediment to sensitive areas, such as aquatic habitats located downstream in the channel. Enviro-Ridge acts as an energy dissipater, helping to improve water quality and remove sediment from fresh water flow.

Enviro-Ridge Specifications
Polymer UV-resistant high-density polyethylene (HDPE)
Porosity 25% – 50% open area
Length 1.0 m
Height 0.225 m
Colour Black

 

Gradient Spacing
1% 23.0 m
2% 11.5 m
3% 7.7 m
4% 5.8 m
5% 4.6 m
6% 3.8 m
7% 3.3 m
8% 2.9 m
9% 2.6 m
10% 2.3 m

Spacing is based on calculating the height of Enviro-Ridge divided by the gradient. For example: On a 2% gradient, 0.23 m (height of Enviro-Ridge) / 0.02 gradient = 11.5 m spacing.


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