Helena Joyce
Sediment pollution is a major issue for rivers, streams, and bodies of water. It occurs when water carries sediment through runoff downstream, impairing drinking water quality and the natural environment, affecting wildlife. Sediment pollution can be prevented using various methods, including stormwater management products and best management practices (BMPs), erosion control, and sediment barriers. Decorative retaining walls, mulching, and planting native plants and grasses can also help prevent sediment erosion. Additionally, silt fences, sediment barriers, and turbidity curtains can be used to control sediment movement and prevent it from entering waterways.
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What You'll Learn
- Use storm drain filters, such as drain guards, filter socks, and gravel bags
- Implement erosion control methods, such as decorative retaining walls and mulching
- Use sediment barriers and silt fences for perimeter sediment control
- Create a riparian buffer by leaving vegetation and plants next to streams to root and hold down soil
- Utilise dust control methods, such as dust suppression systems, to prevent and mitigate airborne sediment particles
Use storm drain filters, such as drain guards, filter socks, and gravel bags
Storm drain filters are an effective and low-cost solution for preventing sediment pollution caused by stormwater runoff. They are designed to fit over the drain, trapping debris, sediment, and trash before it enters the storm drain grate. This prevents harmful pollutants from entering water bodies and causing environmental damage.
One type of storm drain filter is the over-grate drain filter, which is designed to be user-friendly and easy to install. It does not require any special equipment or the removal of the grate. These filters come in square or round designs and are made of durable and long-lasting monofilament geotextile material fabric. The sediment ridges around the perimeter help sediment settle, and the overflow port in the centre of the filter increases the flow rate, preventing standing water.
Another option for storm drain filters is the Ultra Drain Guard®, which is made of rugged polypropylene and can be easily rinsed and reused. It has a deep accumulation pocket that can hold a large capacity of sediment, dirt, and soil. This drain guard is designed for easy removal with a backhoe, forklift, or other equipment.
Filter socks are another effective tool for sediment control and stormwater management. These flexible, tubular devices are filled with organic materials such as compost and are designed to trap sediment and pollutants as stormwater passes through. They are particularly useful on construction sites, where stormwater runoff often carries harmful pollutants. Filter socks are easy to install, cost-effective, and environmentally friendly. They can be placed in high-runoff areas, including construction site perimeters, slopes, near storm drains, or areas with heavy foot or vehicle traffic.
Gravel bags, also known as gravel sandbags, are effective tools for erosion control and sediment management. They are commonly used to create barriers, embankments, or structures that prevent erosion, redirect water flow, and trap sediment. Gravel bags are often deployed in construction sites, along shorelines, or in areas prone to soil erosion. A gravel bag berm is created by arranging gravel-filled bags in a specific pattern to control water flow, prevent erosion, and manage sediment runoff.
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Implement erosion control methods, such as decorative retaining walls and mulching
Sediment pollution is a major issue for rivers, streams, and bodies of water. It occurs when water carries sediment downstream, causing billions of dollars worth of damage. This sedimentation affects the quality of drinking water and wildlife environments. One effective way to prevent sediment pollution is to implement erosion control methods such as decorative retaining walls and mulching.
Decorative retaining walls can be used to break up the rate of water descent and control erosion on slopes. These walls can be constructed using a variety of materials, including native stone, stack stone, segmented blocks of natural stone, poured concrete walls, or segmented concrete blocks. Functional retaining walls must be properly engineered to include features such as drain pipes, backfill, weep vents, and proper height and offset. The width of the base of a retaining wall should be about one-third of its height, and it should be sloped back against the soil to provide greater strength.
Retaining walls can also be constructed using geosynthetic materials such as SlopeGrid, which is a lightweight, high-tensile-strength grid that can be stretched across a slope. This alternative offers better soil drainage and eliminates the risk of wall failure due to hydrostatic pressure buildup. Another solution is the Cell-Tek Cellular Confinement System, which helps stabilize steep slopes and provides a platform for installing pavers or stone systems.
Mulching is another effective method for erosion control. It involves placing materials such as grass, hay, wood chips, wood fibres, straw, or gravel on exposed or recently planted soil surfaces. Mulching helps stabilize soils and reduce stormwater runoff velocity. When using mulching for erosion control, it is important to anchor the mulching materials to resist wind displacement. This can be done by applying a tackifier, stapling netting over the top, or using a mulch crimping tool.
By implementing erosion control methods such as decorative retaining walls and mulching, individuals and communities can play a vital role in preventing sediment pollution and protecting the quality of water sources and wildlife habitats.
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Use sediment barriers and silt fences for perimeter sediment control
Sediment barriers and silt fences are a crucial part of perimeter sediment control, particularly in construction sites, where they help prevent sediment pollution. Sediment barriers are temporary controls that intercept and remove soil and debris from sheet flow runoff. Silt fences are a type of sediment barrier that can be staked around the perimeter of a construction site. They are made of synthetic filter fabric (geotextiles) stretched between wooden or metal stakes.
Silt fencing is a commonly used method of perimeter control, especially in North America, due to its low cost and simple design. However, its effectiveness can be limited by poor installation, improper placement, and inadequate maintenance. It is important to note that silt fences are designed for sheet flow and should not be used in areas of concentrated flow like ditches.
When installing silt fences, it is crucial to ensure proper siting, installation, and maintenance. The design should create a pooling of runoff, allowing sedimentation to occur through settling rather than filtration by the fabric. The stakes are installed on the downhill side of the fence, with the bottom edge of the fabric trenched into the soil and backfilled on the uphill side. This process can be challenging due to the difficulty of moving the soil from the downside to the upside of the trench.
To enhance the effectiveness and longevity of a silt fence system, some state agencies recommend the "static slicing" installation technique. This method involves inserting a narrow blade with a wedge-shaped tip into the soil, slightly disrupting it upward while simultaneously inserting the silt fence fabric into the slot with a moving pivot. This technique helps maintain soil on both sides of the fence and ensures proper compaction, which is critical to the fence's performance.
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Create a riparian buffer by leaving vegetation and plants next to streams to root and hold down soil
Leaving vegetation and plants next to streams to root and hold down soil, also known as creating a riparian buffer, is an effective way to prevent sediment pollution. Riparian buffers are strips of vegetation, including trees, shrubs, and grass, planted next to streams or other water bodies. The roots of these plants help to hold streambanks secure, preventing excess erosion and reducing sediment pollution.
When creating a riparian buffer, it is important to consider the specific needs of your stream or waterway. Factors such as hydrology, prior land use, the slope of the land, and desired water quality benefits will determine the width and composition of your riparian buffer. For example, a small stream with minimal impact from adjacent land use may only require a narrow buffer of native trees and shrubs closest to the water's edge. In contrast, a larger water body with intense adjacent land use may require a wider buffer that includes additional zones of vegetation to provide adequate protection.
It is recommended to plant native species of water-tolerant trees and large shrubs in the area closest to the stream. These plants will provide streambank stabilization and leaf litter, which is beneficial for the stream ecosystem. Native plants are better adapted to local microclimates and will establish stronger root systems more quickly, making them more effective at preventing erosion and filtering runoff.
In the zone upland from the water's edge, plant native, fast-growing, smaller, and shade-tolerant trees or shrubs. This zone helps absorb and hold water in the soil while also filtering nutrients and pollutants. The fastest-growing plants in this zone will be able to uptake and store nutrients more effectively.
The zone farthest from the stream and closest to land use areas should be planted with native grasses, wildflowers, or other herbaceous plants. These plants slow down fast-moving water runoff and help to filter sediment, providing additional protection for the stream.
By following these guidelines and creating a riparian buffer, you can effectively prevent sediment pollution by allowing vegetation to root and hold down soil, stabilizing streambanks, and filtering runoff before it reaches the stream.
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Utilise dust control methods, such as dust suppression systems, to prevent and mitigate airborne sediment particles
Sediment pollution is a major issue affecting water bodies, including rivers, streams, and oceans. It occurs when water carries sediment downstream, causing damage worth billions of dollars. Sediment pollution not only affects the quality of drinking water but also impacts wildlife environments.
To prevent and mitigate airborne sediment particles, utilising dust control methods, such as dust suppression systems, is essential. Dust suppression systems are employed in various industries, including demolition, mining, construction, and waste management, to manage dust and protect the health and safety of workers and the public. These systems use high-pressure misting or fogging techniques to trap and control dust particles, preventing them from becoming airborne and causing air pollution.
One effective dust suppression product is the dust cannon, which emits microparticles that attach to dust particles, causing them to fall due to gravity. Additionally, dust suppression systems can be customised to specific facilities, with the appropriate misting devices, nozzles, and additional components to address high-dust areas effectively.
Water spraying systems are another technique used in dust suppression. This method involves spraying water onto dust-prone areas to keep dust particles damp and prevent their dispersal. While simple and cost-effective, it may require frequent application and can lead to water runoff issues.
Chemical dust suppressants, such as polymers, surfactants, and binders, are also utilised. These chemicals are applied to dust-prone areas to create a crust or bind particles together, offering a more durable solution than water. However, environmental and health considerations must be taken into account when using chemical suppressants.
Physical barriers, such as walls, fences, and enclosures, are effective for localised dust control, especially in high-wind areas. They contain dust within a specific area, preventing its spread to other locations.
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Frequently asked questions
Sediment pollution occurs when water carries excess sediment through runoff downstream, affecting the quality of drinking water and wildlife environments.
Sediment pollution can have devastating effects on aquatic ecosystems, drinking water quality, and wildlife habitats. It can clog the gills of fish, make rivers and streams unnavigable, and disrupt the food chain, leading to a decline in the fish population and organism life.
There are several methods to prevent sediment pollution, including the use of stormwater management products and best management practices (BMPs). Implementing erosion control measures, such as decorative retaining walls, mulching, and planting native plants and grasses can also help prevent sediment erosion.
Specific techniques and devices include storm drain filters, silt fences, sediment barriers, turbidity curtains, and infiltration BMPs like swales, trenches, and infiltration basins.
