Meghan Hodges
Runoff pollution is a significant threat to clean water and healthy ecosystems worldwide, with an estimated 80% of ocean pollution stemming from land-based sources. As rainwater and snowmelt flow over various surfaces, they pick up and carry numerous contaminants, including fertilizers, pesticides, oil, bacteria, and waste, into nearby water bodies. This toxic mix of pollutants can have detrimental effects on aquatic life, drinking water sources, and recreational areas. To combat this issue, individuals and communities can implement a range of solutions, such as responsible land management, reduced chemical use, improved urban planning with green infrastructure, and better waste disposal practices. These collective efforts are crucial in minimizing the impact of runoff pollution and protecting our precious water resources.
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What You'll Learn
Reduce chemical use
Reducing chemical use is an important step in preventing polluted runoff, which occurs when rainwater washes pollutants from roads, farms, and industrial areas into waterways, causing harm to aquatic ecosystems and human health. Here are some ways to reduce chemical use and minimize the impact of polluted runoff:
Agricultural Practices
Farmers play a crucial role in reducing chemical use and preventing polluted runoff. They can adopt the following practices:
- Applying fertilizers sparingly, at the right time of year, and with the right method to minimize fertilizer reaching water bodies.
- Using organic slow-release fertilizers and following manufacturer recommendations.
- Implementing conservation tillage by reducing the frequency and intensity of tilling fields, improving soil health, and reducing erosion and runoff.
- Managing livestock access to streams by fencing off waterways to keep animal waste out of the water, reducing nitrogen and phosphorus pollution.
- Ensuring year-round ground cover by planting cover crops or perennial species to prevent soil erosion and nutrient loss during periods of bare ground.
- Planting field buffers, such as trees, shrubs, and grasses, along the edges of fields, especially those bordering water bodies.
- Adopting nutrient management techniques, such as applying the right amount of nutrients (fertilizer and manure) at the appropriate time and location.
Urban and Suburban Practices
Individuals and communities in urban and suburban areas can also take measures to reduce chemical use and prevent polluted runoff:
- Responsible land management practices, such as reducing the use of pesticides and fertilizers in gardens and public spaces.
- Improving urban planning by incorporating more green spaces, rain gardens, and green roofs, which help absorb rainwater and reduce surface runoff.
- Installing permeable surfaces, such as interlocking pavers, that allow water to penetrate and be absorbed into the soil, reducing runoff.
- Properly disposing of household chemicals and waste, including motor oil and other automotive fluids, to prevent them from entering the sewer system and contaminating waterways.
- Maintaining septic systems through regular inspections and pumping to prevent pollution of nearby lakes and streams.
- Picking up after pets and properly disposing of pet waste to reduce bacterial contamination of waterways.
By implementing these practices, we can significantly reduce chemical use and minimize the impact of polluted runoff on our ecosystems and water sources.
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Improve urban planning
Urban planning can play a significant role in reducing polluted runoff, which is caused by rain that falls on impervious surfaces such as roads, parking lots, and rooftops, and carries pollutants into nearby water bodies. Here are some ways urban planning can help mitigate this issue:
Promote Permeable Surfaces: Instead of using impervious materials like concrete or asphalt, urban planners can encourage the use of permeable surfaces that allow water to penetrate and absorb into the soil. This includes permeable pavers for parking lots, walkways, and patios, which can also reduce the formation of ice slicks.
Implement Natural Landscaping: Urban areas can incorporate more natural landscaping features, such as rain gardens, green roofs, and bioswales, which help to slow down and filter stormwater runoff. Native, drought-resistant plants can be used, and soil high in organic content can improve water retention and reduce the need for excessive watering.
Create Retention and Detention Basins: Retention and detention basins can be designed to hold and slowly release stormwater, reducing the impact of runoff. These basins can be integrated into parks, open spaces, or specifically designated areas within the urban landscape.
Incorporate Green Infrastructure: Green infrastructure refers to natural solutions that mimic ecological processes to manage stormwater. This includes the use of constructed wetlands, porous asphalt, green walls, and tree boxes, which can all help to absorb and filter stormwater runoff, reducing the amount of pollution entering water bodies.
Optimize Drainage Systems: Urban planners can design drainage systems that direct stormwater toward treatment facilities or natural filtration systems before releasing it into the environment. This includes the use of French drains, which are drainage ditches filled with loose rock and perforated piping, guiding water away from impervious surfaces.
By incorporating these strategies into urban planning, communities can significantly reduce the amount of polluted runoff, protecting nearby water bodies and preserving the natural environment.
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Install permeable surfaces
Installing permeable surfaces is an effective way to prevent polluted runoff. Permeable surfaces allow water to penetrate and be absorbed into the soil, reducing the volume of runoff that washes into water supplies. This helps to filter out pollutants and recharge groundwater supplies.
There are several types of permeable surfaces that can be installed, including:
- Pervious asphalt
- Pervious concrete
- Interlocking pavers
- Plastic grid pavers
- Permeable pavers
These materials can be used to replace traditional pavement on driveways, patios, and walkways, which are often major contributors to runoff pollution. When installing permeable surfaces, it is important to consider the intended use and load-bearing requirements. For example, if installing a permeable surface intended to support vehicle loads, such as a driveway, professional help may be required.
In addition to reducing runoff, permeable surfaces can also provide other benefits such as reducing the need for road salt, reducing construction costs by eliminating the need for conventional drainage features, and reducing the heat island effect commonly associated with asphalt and other paving materials.
Another way to increase permeability and reduce runoff is to implement landscaping projects that slow, catch, use, and/or filter rainwater or snowmelt. This can include rain gardens, which are shallow depressions in the landscape that capture stormwater and allow it to gradually infiltrate the soil. Native, drought-resistant plants can also be incorporated to reduce the need for watering and improve water retention.
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Maintain your septic system
Maintaining your septic system is crucial to prevent malfunctions and failures, which can be costly to fix and cause harm to the environment. Septic systems are typically used in rural or lot settings where central wastewater treatment is not efficient. They treat wastewater and allow it to filter naturally through the soil, preventing contamination and diseases from polluting the environment.
Inspections and Pumping
Regular inspections and pumping are essential to ensure your septic system functions properly. The recommended frequency for pumping varies depending on the system and usage, but it typically ranges from once every two to five years for household septic tanks. Alternative systems with mechanical components should be inspected more often, generally annually. During an inspection, a professional will check for leaks and examine the scum and sludge layers in your tank. If the sludge level is too high, pumping is required.
Water Conservation
Conserving water improves the operation of your septic system by reducing the volume of water entering it. Efficient water use can be achieved through water-conserving devices in faucets, showerheads, and toilets, as well as repairing leaks and running appliances only when full.
Redirecting Rainwater
Ensure that rainwater runoff is directed away from the drain field or leach field. Excess water can slow down or stop the wastewater treatment process, leading to issues like slow drains and toilet flushing problems.
Waste Disposal
Avoid disposing of household chemicals, wipes (even those labelled as "flushable"), personal care products, and other solids down the drain or toilet. These items can disrupt the natural bacterial processes in the septic tank and drain field, leading to malfunctions and reduced efficiency.
Landscaping
Landscaping can play a role in maintaining your septic system. Avoid planting trees too close to the drain field, as their roots can infiltrate the system. However, grass or small plants above the septic system can help hold the drain field in place.
By following these maintenance guidelines, you can ensure the proper functioning of your septic system, preventing polluted runoff and protecting the environment.
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Sweep up pollutants
Stormwater runoff is rain that falls on streets, parking areas, sports fields, gravel lots, rooftops, or other developed land and flows directly into nearby bodies of water. This runoff can pick up and mix with pollutants on the ground, such as accidental spills, leaky storage containers, tobacco spit, pet waste, pesticides, fertilizer, oil, and other contaminants. These pollutants can then rush into nearby storm drains and gutters, eventually making their way into local waterways.
One way to help mitigate this issue is to sweep up pollutants from driveways, sidewalks, and roads. This includes sweeping up fertilizers, grass clippings, and leaves. By regularly sweeping and removing these pollutants from impervious surfaces, we can prevent them from being washed away by stormwater runoff.
For example, if you apply fertilizer to your lawn shortly before a rainstorm, it is likely that much of it will be washed into nearby waterways. To prevent this, it is recommended to apply fertilizer well in advance of a rainstorm, use it sparingly, and opt for organic slow-release fertilizers. Additionally, by regularly sweeping and disposing of any fertilizer remaining on hard surfaces, you can further reduce the amount that ends up in the water supply.
Similarly, pet waste can be a significant source of bacteria and can lead to the contamination of local wetlands, streams, lakes, and rivers. It is important to always pick up after your pets and dispose of their waste properly. By regularly sweeping and disposing of pet waste from driveways, sidewalks, and roads, you can help prevent the spread of bacteria and reduce the impact on nearby waterways.
In addition to sweeping, there are other measures that can be taken to reduce the impact of polluted runoff. This includes installing permeable surfaces, such as interlocking stone pavers or pervious pavement, that allow water to penetrate and be absorbed into the soil. Creating "green infrastructure" by planting rain gardens or other natural spaces can also help to slow down and soak up polluted runoff.
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Frequently asked questions
Runoff pollution happens when rainwater washes pollutants from roads, farms, and industrial areas into waterways, threatening ecosystems, human health, and wildlife.
The effects of runoff pollution are vast and long-lasting. It erodes streams, kills fish, pollutes drinking water, floods homes, reshapes waterways, endangers aquatic life, and contaminates recreation areas.
To stop polluted runoff, you can implement permeable surfaces that allow water to penetrate and be absorbed into the soil. You can also reduce the use of chemicals, including fertilizers and pesticides, and practice responsible land management. Additionally, you can sweep and compost grass clippings and leaves from driveways and walkways, and properly dispose of motor oil and other automotive fluids.
