Non-Point Source Pollution Envirothon Practice Test

Which basin holds water permanently or long-term?

Retention basin Detention basin Holding pond Infiltration basin

Correct Answer:

Retention basin

Explanation:

The key idea is how long water stays in a basin between events. A retention basin is built to keep water in place for extended periods, creating a standing pool that remains in the basin long-term. In contrast, a detention basin is designed to capture runoff during rainstorms and then drain it out, so it’s typically dry between events. A holding pond may store water for a period but isn’t defined by a permanent, year-round pool. An infiltration basin is meant for water to seep into the ground rather than stay in the basin. Therefore, the basin that holds water permanently or long-term is the retention basin.

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