Brian Barton
Sediment pollution is a major issue for rivers, streams, and bodies of water, causing billions of dollars worth of damage. Sediment is produced by the erosion of rocks and soil, which is accelerated by human activities such as construction. This sediment can carry pollutants like oils, heavy metals, and solvents into waterways, harming aquatic life and affecting drinking water quality. To prevent sediment pollution, various methods and tools can be employed, including stormwater best management practices (BMPs), erosion control, and the use of sediment barriers and filtration devices. These practices aim to reduce stormwater runoff, filter pollutants, and prevent sediment from entering and spreading in waterways.
| Characteristics | Values |
|---|---|
| Sediment pollution prevention methods | Storm drain filters, curb guards, grate guards, basin guards, staked silt fence, sediment barriers, turbidity curtains, silt dikes, silt socks, ditch checks, dust control methods, biodegradable stormwater filtration devices, erosion control, sediment controls, mulch berms, sidewalk subgrade barriers, swales, trenches, infiltration basins |
| Sediment pollution causes | Erosion of rocks and soil, human intervention, weather events |
| Sediment pollution effects | Harmful to human health, animal health, environmental health, wildlife habitats, drinking water quality |
| Sediment pollution accelerators | Human activities such as construction |
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What You'll Learn
- Use storm drain filters, such as drain guards and gutter guards
- Implement erosion control measures, like silt fences and sediment barriers
- Use biodegradable solutions, such as coir logs and straw wattles
- Prevent sediment runoff with perimeter control and onsite BMPs
- Use dust control methods, such as spraying a fine mist to settle dust
Use storm drain filters, such as drain guards and gutter guards
Storm drain filters, such as drain guards and gutter guards, are an effective way to control sediment pollution. Drain guards and gutter guards are a type of stormwater best management practice (BMP) that can help prevent sediment from entering storm drains and polluting waterways.
Drain guards and gutter guards are designed to capture silt, sediment, and other debris from stormwater before it enters the storm drains. They are typically placed over the storm drain grate or curb inlet, acting as a filtration device. This helps to prevent sediment runoff, which is a major cause of sediment pollution in rivers, streams, and other bodies of water.
One example of a drain guard is the Ultra-Gutter Guard®, which is made from recycled synthetic fibers. It is designed to be practical and reusable, with built-in overflow ports that allow water to flow freely during extreme rainfall events, preventing the guard from becoming blocked. The Ultra-Gutter Guard® can be easily moved from drain to drain and rinsed off to remove dirt, mud, and sediment when necessary.
In addition to drain guards and gutter guards, there are also catch basin filters that are placed within the storm drain to capture sediment and debris as they enter. These filters can capture small contaminants, such as plastic pellets, in addition to larger debris. Catch basin inserts, such as the Ultra-Drain Guard, can be adjusted to capture contaminants of varying sizes.
Other types of stormwater filtration devices include gravel bags, filter socks, silt dikes, silt socks, and ditch checks, which are often made from polypropylene geotextiles or biodegradable materials. These devices can help support natural habitats in reducing sediment pollution while also controlling erosion.
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Implement erosion control measures, like silt fences and sediment barriers
Silt fences and sediment barriers are effective tools in the fight against sediment pollution. They are often used as a preventative measure on construction sites, where soil disturbance is common, to ensure that sediment does not leave the site and pollute nearby waterways.
A silt fence, sometimes misleadingly called a filter fence, is a temporary sediment control device. It is widely used due to its low cost and simple design. The fence is made of a synthetic filter fabric, or geotextile, stretched between wooden or metal stakes. The fabric is placed downhill from the disturbance area, and the bottom edge is trenched into the soil and backfilled uphill. This design creates a pooling of runoff, allowing for sedimentation to occur. Water can pass through the fabric, but it often becomes blocked with fine soil particles, which is a common issue with all sediment-retention devices.
Silt fences are most effective when properly installed and maintained. The static slicing installation technique, which involves inserting a blade into the soil to slightly disrupt it while simultaneously inserting the fabric, has been shown to be the most efficient and effective method. Poor installation can lead to increased downstream pollution, as the fabric can become clogged and cause flooding.
Sediment barriers, such as silt fences, function as the last line of defence before stormwater runoff leaves a site. They create areas of impoundment, or pooling water, which reduces runoff velocity and retains sediment onsite. This helps to prevent sediment from entering waterways and causing pollution.
By implementing these erosion control measures, such as silt fences and sediment barriers, we can effectively minimise the impact of sediment pollution on our environment and water sources.
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Use biodegradable solutions, such as coir logs and straw wattles
Biodegradable solutions such as coir logs and straw wattles are effective tools to control sediment pollution. These natural solutions help control erosion, providing silt filtration while being environmentally friendly.
Coir Logs
Coir logs, also known as coconut fibre logs, are made from natural coconut husk fibres. They are cylindrical in shape and are used to control erosion in construction zones, restoration areas, and for environmental preservation on hillsides. Coir logs are strong enough to withstand heavy rains and, when staked to a hillside, can prevent soil slippage by holding water until the sediment settles. They are also used to stabilize shorelines and prevent the buildup of items such as rocks and plant debris from interfering with the flow of water.
Coir logs are eco-friendly and safe for the environment and wildlife. They are installed by first clearing the area of debris and then digging a trench deep enough to fit two-thirds of the log. Coir logs can also be integrated with native vegetation by planting suitable plants within the log structure. As the plants grow, their roots reinforce the log's integrity, enhancing its erosion control capabilities.
Straw Wattles
Straw wattles are another versatile solution to erosion control that can be installed in vulnerable areas on a worksite. These thick tubes, also known as straw worms or bio-rolls, are typically placed on slopes without proper vegetative cover. They help filter out fine sediment particles, absorb excess runoff, and increase water infiltration of the surrounding soil. Straw wattles are effective in protecting storm drains and reinforcing rock stockpiles.
To install straw wattles, a trench at least 6 inches deep is dug, and the wattle is placed inside and secured with surrounding soil. They are a cost-effective alternative to other sediment control methods such as silt fences, offering stronger and longer-lasting protection.
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Prevent sediment runoff with perimeter control and onsite BMPs
Sediment pollution is a major issue for rivers, streams, and bodies of water. It occurs when water carries sediment downstream through stormwater runoff, causing billions of dollars worth of damage. Sediment pollution can be prevented with the right tools and practices, including perimeter control and onsite best management practices (BMPs).
Perimeter control BMPs are essential as they serve as the last protection before sediment leaves a site and enters roadways, storm drains, or adjacent properties. They should be installed before any site grading activities and integrated into an erosion prevention and sediment control system, taking into account the entire site. Perimeter controls should be placed on all down-gradient limits of disturbance and upgradient of buffer zones.
There are various types of perimeter BMPs available, each with its own advantages and disadvantages. For example, silt fences act as barriers to divert and slow down surface flows, containing sediment onsite. However, they have limited filtration capacity. Sidewalk subgrade barriers use gravel to temporarily trap sediment-laden runoff but have limited sediment capacity.
To enhance the effectiveness of perimeter controls, they should be combined with other BMPs. This includes implementing upslope diversions to minimise the volume of runoff and sediment reaching perimeter controls, reducing the length of exposure time, and adequately seeding and mulching disturbed areas.
In addition to perimeter controls, onsite BMPs such as storm drain filters play a crucial role in preventing sediment runoff. These filters, such as the drain guard, gutter guard, and gravel bags, are placed over storm drain grates to capture sediment and debris. Other onsite BMPs include the curb guard, grate guard, and basin guard, which help prevent sediment from entering waterways.
By utilising a combination of perimeter control and onsite BMPs, sediment runoff can be effectively managed, protecting our waterways and the environment from the harmful effects of sediment pollution.
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Use dust control methods, such as spraying a fine mist to settle dust
Sediment pollution is a major issue affecting rivers, streams, and other bodies of water. It occurs when water carries sediment downstream, causing billions of dollars worth of damage and affecting drinking water quality and wildlife environments. To prevent sediment pollution, it is essential to implement effective dust control methods, such as spraying a fine mist to settle the dust.
Dust control is a critical aspect of sediment pollution prevention. When sediment is disturbed, it can create thick clouds of dust that can travel and settle in new locations, contributing to air and water pollution. By using dust suppression systems, the dust particles can be settled, preventing them from spreading further.
One effective dust control method is the use of a fine mist spray. This involves spraying a fine mist of water or other liquids over the dusty area to weigh down and settle the dust particles. The moisture helps to bind the particles together, making them heavier and less likely to become airborne. This technique is particularly useful in dry and windy conditions where dust is more likely to be dispersed over a wide area.
To ensure the effectiveness of fine mist spraying, several factors should be considered. Firstly, the type of dust and its origin should be identified. Different types of dust, such as silica, wood, or metal dust, may require specific approaches or treatments. Understanding the dust source, such as cutting, grinding, drilling, or machinery operations, can help in determining the most suitable control measures.
Additionally, regular maintenance and monitoring are crucial. Equipment like filters, hoses, and vacuums used in dust extraction systems should be inspected and maintained for optimal performance. Dust levels should also be regularly monitored to ensure compliance with safety standards and to adjust the dust control strategy as needed.
In conjunction with fine mist spraying, other dust control techniques can be employed. These include the use of gravel to protect soils from vehicle wheels, good road drainage to prevent puddles and reduce dust dispersion, and the application of dust palliatives or suppressants that bind particles together, making them less likely to become airborne. By combining these methods with fine mist spraying, a comprehensive approach to dust control and sediment pollution prevention can be achieved.
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Frequently asked questions
Sediment pollution occurs when water carries sediment through runoff downstream. Sediment is the natural process of rocks and soil particles breaking down and being transported by wind, water, or ice. Human activities such as construction can accelerate this process, leading to increased erosion and runoff that carries sediment into nearby waterways.
Sediment pollution can have devastating effects on aquatic ecosystems, drinking water quality, and wildlife habitats. It can cause turbidity or cloudy water, which inhibits plant growth, animal development, and clean drinking water. Sediment pollution can also lead to the stagnation of animal life and the dispersion of nutrients that promote the growth of blue-green algae.
Sediment pollution can be controlled using a combination of tools and practices, including:
- Stormwater Best Management Practices (BMPs)
- Erosion and sediment controls
- Storm drain filters (e.g., drain guards, filter socks, gravel bags, and gutter guards)
- Catch basin filters
- Sediment barriers and staked silt fences for perimeter sediment control
- Biodegradable erosion and sediment control devices (e.g., coir logs, straw wattles)
- Geotextile fabrics for controlling river bank erosion
- Infiltration BMPs such as swales, trenches, and infiltration basins
Specific measures to prevent sediment pollution include:
- Planning projects to minimise soil exposure and conducting them during dry weather conditions.
- Installing catch basin inserts in all catch basins and stormwater inlets.
- Installing sediment controls around the project perimeter and soil stockpiles (e.g., straw wattles, sediment fences, mulch berms).
- Diverting stormwater away from exposed soil using diversions like straw wattles or berms.
- Regularly inspecting and maintaining BMPs.
- Providing permanent stabilisation upon project completion, such as seeding and applying ground cover.
