6.5. Urban Drainage

• How do urban drainage systems prevent urban flooding?

  By removing excess water
• What is the primary function of catch basins in a drainage system?

  Collect surface runoff
• The integrated network of drainage components ensures effective flood control in urban areas.

  True
• What is stormwater in urban environments?

  Rainwater runoff
• Stormwater refers to rainwater runoff that accumulates in urban environments after a rainfall event
• Urban drainage refers to the system of pipes, channels, and infrastructure
• Urban drainage systems help maintain water quality by directing runoff away from populated areas
• Catch basins filter out large debris
• Wastewater refers to any water that has been used and contaminated by human activities
• Rain gardens are planted depressions that absorb and filter runoff
• Detention basins are temporary water storage areas used in conventional stormwater management.


  True
• Conventional methods aim for rapid removal of runoff
• Sustainable methods are more efficient for low-intensity storms but can reduce peak flows
• A typical urban drainage system includes catch basins, sewer networks, pump stations, and outfalls
• Wastewater refers to any water that has been used and contaminated by human activities
• Stormwater refers to rainwater runoff that accumulates in urban environments after a rainfall event
• Sustainable stormwater management utilizes natural processes to handle runoff.


  True
• Sustainable stormwater management reduces flood risks and promotes ecosystem health.

  True
• What is one sustainable urban planning method to reduce stormwater runoff?

  Green roofs
• How does inadequate urban drainage contribute to water pollution?

  Pollutants carried by runoff
• Match the sustainable drainage method with its description:

  Rain gardens ↔️ Planted depressions that filter runoff

  Green roofs ↔️ Vegetation-covered rooftops for water retention

  Permeable pavements ↔️ Surfaces that allow water infiltration
• Urban drainage systems are crucial for preventing urban flooding.


  True
• Urban drainage systems reduce the breeding of disease-carrying pests.


  True
• Steps in the flow of water through a typical urban drainage system

  1️⃣ Surface runoff collected by catch basins

  2️⃣ Flow through sewer network

  3️⃣ Elevation by pump stations (if needed)

  4️⃣ Discharge through outfalls
• Match the wastewater source with its type and key contaminants:

  Residential ↔️ Sanitary wastewater, Greywater ||| Organic waste, detergents, pathogens

  Industrial ↔️ Industrial wastewater ||| Chemicals, heavy metals, process waste

  Commercial ↔️ Sanitary wastewater, Greywater ||| Food waste, cleaning agents
• Sustainable stormwater management provides environmental and economic benefits over conventional methods.


  True
• Match the sustainable stormwater management method with its description:

  Rain gardens ↔️ Planted depressions that absorb runoff

  Green roofs ↔️ Vegetation-covered rooftops for water retention

  Permeable pavements ↔️ Surfaces allowing water infiltration
• Sustainable methods often lead to increased pollutant discharge.

  False
• Urban drainage systems are crucial for preventing urban flooding.


  True
• Catch basins filter out large debris to prevent clogging in sewers.


  True
• Greywater contains more contaminants than sanitary wastewater.

  False
• What is the purpose of detention basins in stormwater management?

  Temporary water storage
• What is the function of rain gardens in stormwater management?

  Absorb and filter runoff
• Match the stormwater management method with its description:

  Detention basins ↔️ Temporary water storage areas

  Green roofs ↔️ Vegetation-covered rooftops

  Permeable pavements ↔️ Surfaces allowing water infiltration
• Community engagement is essential for improving urban drainage systems.


  True
• Inadequate drainage leads to erosion, which degrades landscapes
• What is one long-term environmental benefit of sustainable drainage methods?

  Enhanced biodiversity
• Arrange the following aspects in the order they appear in the comparison of conventional and sustainable stormwater methods:

  1️⃣ Purpose

  2️⃣ Environmental Impact

  3️⃣ Cost
• What is a key difference between the upfront costs of conventional and sustainable methods?

  Sustainable methods have higher costs
• Match the importance of urban drainage with its description:

  Flood Prevention ↔️ Removes excess water from cities

  Water Quality ↔️ Prevents spread of waterborne pollutants

  Public Health ↔️ Reduces risk of waterborne diseases