Understanding Flooding

Watershed Study Flood Risk Map

The flood risk map displays detailed flood depths for a storm that has a 1% chance of occurring in areas where watershed studies have completed this analysis.

Flash Flooding vs. Lake Level Flooding

The two types of flooding that occur in Madison are Flash flooding and Lake Level flooding. *Note: Please view the story map using Firefox or Google Chrome browsers. Story maps are not viewable with Internet Explorer.

Watershed: How Flooding Impacted Madison Long Term

The City of Madison experienced historic flooding in August 2018. Watch a video that shares how one flooding event impacted Madison in 30 days long term.

Flood Watch vs. Warning

What is the difference between a Flood Watch and a Flood Warning issued by the National Weather Service?

Lake Level Flooding Resources

FEMA Floodplain Information

Dane County has information about FEMA floodplains and how to read flood maps.

City Groundwater Information

Groundwater flooding can occur in areas that are filled wetlands, particularly on the isthmus, when we experience lots of precipitation over many seasons. This can cause basement flooding, especially in older homes.