Bronte Wells
Watersheds are vital to our communities, providing drinking water, supporting agriculture and manufacturing, and offering recreational opportunities. However, pollution can severely impact the health of watersheds. As water runs through a watershed, it can pick up and carry contaminants, leading to pollution. This process, known as stormwater runoff, is a significant threat to aquatic ecosystems. Urban development, agricultural operations, and industrial activities contribute to this issue by increasing the volume and velocity of runoff, carrying pollutants such as sediments, bacteria, nutrients, and chemicals into waterways. Additionally, natural events like forest fires and climate change can exacerbate the problem by increasing erosion and runoff potential. Protecting watersheds is crucial for maintaining water quality and preserving the health of aquatic ecosystems and the communities that depend on them.
| Characteristics | Values |
|---|---|
| Pollution type | Point source and nonpoint source pollution |
| Point source pollution example | Industrial waste pouring from a factory drain into a river |
| Nonpoint source pollution example | Stormwater runoff |
| Pollutants | Oil, bacteria, nutrients, sediment, metals, fertilizers, pesticides, mercury, lead |
| Pollutant effects | Reduced biodiversity, introduction of invasive species, harm to humans, birds, animals, and fish |
| Causes of pollution | Floods, forest fires, stormwater runoff patterns, location and amount of pollution sources, construction, roads, buildings, moving earth, erosion, impervious surfaces |
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What You'll Learn
Impervious surfaces like roads, parking lots, and rooftops increase runoff
The increased runoff from impervious surfaces can lead to more frequent and larger floods. This is because the water runs off into streams that are not equipped to handle such large volumes of water. For example, the Chesapeake Bay watershed, one of the most diverse ecosystems in the world, is being impacted by the 400,000 acres of impervious surfaces in Maryland. The increased runoff can also cause channel erosion and increased stream temperatures due to the transfer of heat from the impervious surfaces to the water.
The runoff from impervious surfaces also carries pollutants such as oil, bacteria, nutrients, sediment, and metals into surface waters. These pollutants can infiltrate groundwater and concentrate in streams and rivers, ultimately being carried down to the ocean. This can create large dead zones in the ocean with minimal oxygen and threaten coral reef ecosystems.
To mitigate the negative impacts of impervious surfaces on watersheds, some communities are increasing their number of green areas to allow rainfall to infiltrate back into the ground. Rain gardens, which are portions of lawns or landscapes planted to hold, filter, and slowly release surface water runoff, are also becoming a popular method to control stormwater runoff. Permeable paving, such as porous pavement surfaces, is another solution that allows water to percolate below the surface.
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Vegetation removal exposes soil to erosion
A watershed is an area of land that drains rainwater or snow into a single location, such as a lake, stream, or wetland. These water bodies are essential for drinking water, agriculture, manufacturing, and recreation. However, pollution, including runoff and erosion, can severely impact the health of a watershed.
Vegetation removal is a significant contributor to watershed pollution through soil erosion. When natural vegetation is replaced by impervious surfaces like roads, parking lots, and rooftops, it increases the amount and velocity of runoff into surface waters. This leads to erosion, turbidity, and degraded wildlife habitats. The removal of vegetation exposes the soil to erosion by wind and water, a process that is intensified by human activities such as farming and land clearing.
Soil erosion has far-reaching consequences. It results in the loss of fertile topsoil, which is vital for plant growth and carbon sequestration. Eroded soil can end up in rivers and streams, clogging these waterways and causing declines in fish populations and other species. It also contributes to increased flooding and the desertification of once-fertile land. The agricultural plants that often replace natural vegetation, such as coffee, cotton, palm oil, soybean, and wheat, can worsen soil erosion.
To combat the effects of vegetation removal and soil erosion, sustainable land management practices can be implemented. This includes the strategic use of cover crops, selective tillage practices, and terraced farming. By conserving soil and water, projects like China's Grain-for-Green initiative in the Yellow River basin have successfully reduced carbon emissions and preserved watershed health.
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Stormwater runoff from nonpoint source pollution
Nonpoint source pollution is caused by a variety of human activities. For example, when it rains, water runs over agricultural fields where fertilisers and pesticides have been applied. This runoff can carry these chemicals into nearby water bodies, leading to water quality issues. Similarly, rain can wash oil and other pollutants from city streets into drainage systems, contaminating water bodies. Other sources of nonpoint source pollution include pet wastes, leaves, debris, and household chemicals that are improperly disposed of and end up in street gutters and storm drains.
The effects of nonpoint source pollution are widespread and harmful. It is the leading cause of water quality impairment in many regions, particularly in the United States. It has been linked to the formation of large dead zones (areas with minimal oxygen) in the ocean and also threatens coral reef ecosystems worldwide. Nonpoint source pollution can also have negative impacts on drinking water supplies, recreation, fisheries, and wildlife. For example, algal blooms from fertiliser runoff can harm water health, as can mercury and lead seepage into the water supply due to pollution.
Protecting watersheds is crucial to preventing stormwater runoff from nonpoint source pollution. Watersheds are areas of land that drain rainwater or snow into a single location, such as a stream, lake, or wetland. These water bodies provide drinking water, water for agriculture and manufacturing, recreational opportunities, and habitat for plants and animals. Proper watershed protection involves managing the entire watershed that drains into a lake, river, or stream. This includes implementing environmentally sound building and landscaping techniques, such as using permeable surfaces that allow rain to soak in instead of running off.
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Direct contamination of waterways, e.g. industrial waste
Direct contamination of waterways, such as industrial waste pouring from a factory drain into a river, is an example of point-source pollution. This type of pollution is characterised by a single, identifiable source of contamination, such as a factory drain. Industrial activities, such as manufacturing, mining, and waste disposal, are major contributors to water pollution. These industries discharge a range of toxic chemicals, heavy metals, and organic compounds into waterways, either through direct discharge or leakage.
For instance, the Anaconda Aluminum company in Montana contaminated local water sources with lead and chromium. Similarly, Gulf States Utilities in Louisiana released toxins into marshlands, polluting the water with benzene and other chemicals. In addition, the Conklin Dumps in New York leaked volatile organic compounds into the groundwater. These instances of industrial pollution have severe ecological, economic, and environmental impacts, endangering aquatic species and negatively impacting ecosystems.
Another example of direct contamination of waterways is agricultural pollution, which is the top source of contamination in rivers and streams and a significant contributor to wetland and lake contamination. Agricultural activities introduce fertilizers, pesticides, and animal waste into waterways, carrying nutrients, bacteria, and viruses. This type of pollution can lead to algal blooms, which reduce oxygen levels in the water and create "dead zones" devoid of life.
Direct contamination of waterways can also occur through sewage and wastewater discharge. Sewage can contain human and animal waste, carrying disease-causing bacteria and viruses that can lead to illnesses such as cholera, giardia, and typhoid. Additionally, wastewater from commercial, industrial, and agricultural activities can introduce metals, solvents, and toxic sludge into waterways.
To address direct contamination of waterways, it is crucial to regulate and hold industries accountable for their pollution. This includes enforcing proper waste disposal practices and treating wastewater before releasing it into local waterways. Protecting watersheds, which are areas of land that drain water into streams, lakes, or wetlands, is essential for maintaining water quality and the health of aquatic ecosystems and human communities that depend on clean water sources.
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Septic systems and sewage overflow
Septic systems are used by many homeowners for the safe and effective treatment of their wastewater. However, when these systems are poorly designed, sited, or maintained, they can contaminate nearby water bodies and groundwater. This is especially true in areas with high population densities, where the treatment capacity of regional soils can be exceeded.
Failing septic systems can discharge untreated wastewater containing pathogens (e.g. E. coli), nutrients, and other harmful substances directly into the groundwater or onto the ground, which eventually reaches surface waters. This can lead to a range of health issues, including gastro-intestinal symptoms, rashes, skin and eye infections, and flu-like symptoms.
In addition, septic systems can be particularly vulnerable during flooded conditions. When the surrounding soil becomes saturated, septic drain fields can get backed up, causing effluent to flow backwards towards the septic tank and resulting in overflows that leach sewage into people's homes, yards, and stormwater runoff. This can further contaminate coastal waters with nutrients that disrupt ecosystem balance and put human health at risk.
Furthermore, certain geographical areas with a high number of septic systems, such as Florida and Long Island in New York, are more susceptible to sewage pollution. Antiquated systems, such as cesspools and septic systems, are unable to adequately treat sewage, allowing household waste to leach into ground and surface waters. This contributes to the overall pollution of watersheds, which are vital for supplying drinking water, agriculture, manufacturing, and recreational activities.
To address these issues, homeowners can take several steps to prevent their septic systems from impacting nearby water sources. While some solutions are simple, others may be more expensive and involved, requiring consultation with a professional. Additionally, new sewage management solutions are being developed, such as waste-free toilets and resource recovery to generate fuel and drinking water. However, more innovation is needed through cross-sector collaboration between conservation and public health sectors.
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Frequently asked questions
There are two types of pollution: point-source and non-point source. Point-source pollution is the direct contamination of waterways, such as industrial waste being poured from a factory drain into a river. Non-point source pollution is when stormwater runoff picks up and carries contaminants and soil as it runs over and through the watershed.
An example of point-source pollution is the release of chemical compounds known as per-and polyfluoroalkyl substances (PFAS) by industrial facilities into waterways. PFAS are used in commercial products such as food packaging and non-stick coatings.
Non-point source pollution occurs when there is a replacement of vegetation by impervious surfaces like roads, parking lots, and rooftops. This increases the velocity and amount of stormwater runoff, causing it to carry pollutants such as oil, bacteria, nutrients, and metals into surface waters.
Climate change can increase the number of storms and rainfall, leading to more stormwater runoff and the potential for pollutants to be carried into waterways. Additionally, wildfires caused by climate change can result in the loss of vegetation, leaving soils exposed and vulnerable to erosion by rain.
Watershed pollution can have negative impacts on aquatic ecosystems, reducing biodiversity and introducing invasive species. It can also affect the food chain and human health, as polluted water supplies can harm both wildlife and humans who depend on the watershed.
