How might impervious surfaces affect urban hydrology?

How might impervious surfaces affect urban hydrology?

• A. They decrease surface runoff
• B. They increase the integation of water
• C. They increase surface runoff
• D. They enhance groundwater recharge

Answer: (C)

Impervious surfaces play a significant role in urban hydrology by increasing surface runoff. When surfaces such as roads, parking lots, and buildings are impermeable, they prevent water from infiltrating into the ground. Instead of being absorbed into the soil, rainfall and melted snow flow over these surfaces, leading to enhanced surface runoff. This increased runoff can create several issues in urban areas, including elevated flood risks, reduced groundwater recharge, and the possibility of water quality degradation due to pollutants being carried into water bodies by the runoff. Additionally, the quick movement of water can lead to erosion and sedimentation problems in downstream areas, causing ecological disturbances. Understanding the impact of impervious surfaces is crucial for urban planning and stormwater management, as effective strategies need to be developed to mitigate these effects, such as increasing green spaces or implementing permeable materials in construction.

Impervious surfaces play a significant role in urban hydrology by increasing surface runoff. When surfaces such as roads, parking lots, and buildings are impermeable, they prevent water from infiltrating into the ground. Instead of being absorbed into the soil, rainfall and melted snow flow over these surfaces, leading to enhanced surface runoff.

This increased runoff can create several issues in urban areas, including elevated flood risks, reduced groundwater recharge, and the possibility of water quality degradation due to pollutants being carried into water bodies by the runoff. Additionally, the quick movement of water can lead to erosion and sedimentation problems in downstream areas, causing ecological disturbances.

Understanding the impact of impervious surfaces is crucial for urban planning and stormwater management, as effective strategies need to be developed to mitigate these effects, such as increasing green spaces or implementing permeable materials in construction.