APFIVE Impervious Surfaces and Storm Runoff
A suburban development with 65% impervious surface coverage experiences a 100-year storm event. Compared to the same area when it was undeveloped forest with only 5% impervious surface, the current development would most likely experience:
A
Less runoff due to improved drainage systems
B
Equivalent runoff but slower drainage
C
5-7 times more runoff volume
D
Similar peak flows with longer duration
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