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📘 How does a storm drain prevent flooding?

Follow rain from pavement through inlets, pipes, storage, infiltration, and overflow paths.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Runoff
Inlet
Catch basin
Conveyance
Storage
Infiltration
Overflow
Pollution
Maintenance
The complete path

Questions this course answers

Why does pavement increase storm runoff?

Impervious surfaces shed a larger fraction of rainfall instead of absorbing it.

What is the purpose of a catch-basin sump?

The deeper sump provides space for grit and sediment to settle.

How does detention reduce downstream flooding?

A restricted outlet spreads discharge over time and lowers the peak.

Why are overflow routes included?

Planned overflow paths provide safer behavior during exceptional rainfall or blockage.

What most directly preserves inlet capacity?

Debris and sediment reduce the effective opening and should be cleared.

Grounded in trusted sources

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