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How Stormwater Affects Our Rivers and Lakes



Stormwater runoff can have significant impacts on rivers and lakes, leading to various environmental and water quality issues. Here are some ways in which stormwater affects these water bodies:

  1. Increased Flow and Erosion:

  • Stormwater runoff, especially in urban areas with impervious surfaces like roads and parking lots, can lead to increased runoff volume and velocity. This heightened flow can cause erosion along riverbanks and lake shores, leading to sedimentation in water bodies.

  1. Sedimentation:

  • Stormwater runoff often carries sediment, debris, and pollutants from various surfaces. When these materials enter rivers and lakes, they can settle and accumulate, causing sedimentation. Excessive sedimentation can negatively impact aquatic habitats, reduce water clarity, and harm aquatic organisms.

  1. Pollutant Transport:

  • Stormwater runoff can transport various pollutants such as oil, grease, heavy metals, pesticides, and fertilizers from urban and industrial areas into rivers and lakes. These pollutants can have detrimental effects on water quality, aquatic ecosystems, and human health.

  1. Nutrient Loading:

  • Stormwater runoff can carry excess nutrients, such as nitrogen and phosphorus, into water bodies. This nutrient loading can lead to eutrophication, a process where excessive nutrients promote the rapid growth of algae. Algal blooms can deplete oxygen levels in the water, causing harm to fish and other aquatic organisms.

  1. Temperature Changes:

  • Urban stormwater runoff can contribute to temperature changes in rivers and lakes. Paved surfaces absorb heat, and when rainwater runs off these surfaces into water bodies, it can elevate water temperatures. Elevated temperatures can negatively affect aquatic ecosystems, as many species are adapted to specific temperature ranges.

  1. Habitat Degradation:

  • The altered flow patterns and increased sedimentation associated with stormwater runoff can degrade aquatic habitats. This can be particularly harmful to fish spawning areas, aquatic vegetation, and other sensitive ecosystems.

  1. Pathogen Transport:

  • Stormwater runoff can transport pathogens from urban areas, such as bacteria and viruses, into rivers and lakes. This can pose risks to both aquatic life and human health, especially in areas where water is used for recreational activities or as a source of drinking water.

  1. Altered Hydrology:

  • The rapid influx of stormwater can disrupt the natural hydrological balance of rivers and lakes. This can lead to fluctuations in water levels, changes in sediment transport, and alterations in the overall ecological dynamics of the water body.

Efforts to manage stormwater and mitigate its impacts often involve the implementation of green infrastructure, such as permeable pavements, green roofs, and retention basins, to reduce runoff volume and filter pollutants before they reach water bodies. Additionally, regulations and best management practices are implemented to address stormwater issues and protect the health of rivers and lakes.

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