How does paving and concreting areas affect watersheds?

As the amount of impervious paved surfaces increase, watersheds become more vulnerable to pollutants. When rains fall on a conventionally paved impervious surface, the precipitation is generally directed down storm drains, which can result in flooding and overwhelming the storm water management system.

Explanation:

it's not c. i took the quiz and got it wrong. so my best guess is b.

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