Comprehensive Study Notes on City Stormwater Management and Related Pollution Issues 4/10/2026 APES Notes

City Stormwater Management

  • Overview
      - Water flows over urban areas, often without designated pipes or drains.
      - Major nonpoint source pollution due to urban runoff.

Nonpoint Source Pollution

  • Definition: Pollution that does not originate from a single, identifiable source.

  • Urban areas act as a whole nonpoint source.

  • Urban runoff can include:
      - Water flowing over docks and roads.

Septic Systems

  • Definition: A sewage collector system installed in homes.

  • Consists of a large container filled with microbes for decomposing waste.

  • Vulnerabilities:
      - Micro leaks or cracks can lead to waste seeping into the backyard.
      - Pollution detected across the entire backyard, representing a form of nonpoint source pollution.

Point Source vs. Nonpoint Source

  • Examples:
      - Point source: Specific identifiable sources like an abandoned mine opening.
      - Nonpoint source: Larger areas like deforested land or entire mountains.

  • Deforestation and Sediment: Clearing forests leads to sediment pollution affecting waterways:
      - Particulate pollution from sediment heating up rivers, negatively impacting life.

Types of Pollution

  • Common Examples:
      - Abandoned mines causing heavy metals to leach into nearby water sources.
      - Construction sites increasing particulate pollution.

Pollution Effects on Organisms

  • Stress factors affecting water organisms include:
      - Temperature changes, pH levels, and nutrient fluctuations.

  • Examples of Pollutants:
      - Radon: Associated with lung cancer.
      - Carbon Dioxide (CO₂): Can cause suffocation.
      - Lead: Linked to neurological diseases.

Biological Effects of Pollutants

  • Limited growth rates and reproductive functions in affected species.

  • Case example: Eagles in Florida exposed to pesticides leading to thinner egg shells and reduced reproduction rates.

  • Organisms suffer from respiratory difficulties due to contaminated environments.
      - Pesticide exposure leading to deaths in birds through environmental contamination.

Endocrine Disruption

  • Definition: Chemicals interfering with hormone systems (endocrine disruptors).

  • Examples:
      - Changes in sexual characteristics of amphibians like frogs due to chemical exposure.
      - General health concerns due to hormonal disruptions affecting growth and reproduction.

Effects of Water Pollution on Coral Reefs

  • Key Issues:
      - Coral reefs highly sensitive to environmental changes.
      - Thermal Stress: Rising temperatures stress corals leading to death.
      - Urban and agricultural runoff contributing to harmful sediment pollution.
      - Impacts on Photosynthesis: Sediments block sunlight, affecting the survival of coral symbionts (zooxanthellae).

Case Study: Port Everglades

  • Active dredging processes threatening coral reefs nearby.

  • Legal disputes arising from environmental advocacy against harmful dredging practices.

Toxicants in the Environment

  • Dispersants can break apart oil molecules but may harm aquatic life.

  • Toxic products in personal items (e.g., sunscreen may contain harmful chemicals).

  • Importance of using reef-safe products to protect ocean ecosystems.

Oil Pollution Impact

  • Hydrocarbons and oil toxicity harming marine life.
      - Disruption of photosynthesis and respiratory functions in affected organisms.

  • Economics of Oil Spills: Challenges for fisheries and tourism following environmental disasters.

Historical Incidents of Oil Spills

  • Exxon Valdez Spill (1989): A pivotal moment for environmental cleanup awareness and legislation.

  • Clean Water Act (1990): Post-Exxon Valdez legislation requiring oil tankers to feature double hulls.

  • Deepwater Horizon (2010): Catastrophic event with severe impacts on marine ecosystems leading to changes in regulations due to economic and environmental motivations.

Plastic Pollution

  • Ubiquity of plastics in oceans:
      - Nanoplastics present in every aquatic system.
      - Direct impact on marine life, including ingestion by organisms leading to health issues.

  • Case studies of species affected, including whales and seabirds leading to catastrophic growth issues from plastic consumption.

Nutrient Pollution and Eutrophication

  • Nutrient sources include fertilizers leading to algal blooms:
      - Decomposing algae leads to hypoxic zones and dead zones.

  • Dead Zones: Areas where aquatic life cannot survive due to low oxygen levels, often resulting from excessive nutrient runoff.

Impact of Warmer Waters

  • Heat from power plants leads to loss of dissolved oxygen and thermal shock to aquatic life.

  • Examples include coal and nuclear plants releasing warm water into ecosystems.

Management Solutions and Legislative Measures

  • Approaches to address and minimize pollution:
      - Implementing cover crops to reduce soil erosion and nutrient leaching.
      - Managing animal waste effectively.
      - Enhancing nutrient removal processes for wastewater treatment.

Summary of Legislative Actions

  • Cuyahoga River Fires (1969): Highlighted the need for regulatory action, leading to the Clean Water Act and establishment of the Environmental Protection Agency (EPA).

  • Persistent Issues: Ongoing challenges regarding cleanliness, regulation of waterways, and threats from industrial practices.