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Public Works

Phone: 913-715-8300

1800 W Old Highway 56, Olathe, KS 66061

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Floodplain Management


The Stormwater Management Program (SMP) contracted for seven watershed studies between 1998 and 2002. These studies were part of a county-wide effort to provide the following information:

  1. identify existing and potential future flooding problems;
  2. develop planning solutions to mitigate flooding problems;
  3. generate new 1% chance (100 year) floodplain maps based on current conditions and fully urbanized conditions; and
  4. develop the data required by the Federal Emergency Management Agency (FEMA) to update FEMA regulatory 1% chance floodplain maps.

Through this effort, the SMP and the cities have created a tool that will assist in providing a public service to help protect the welfare and safety of Johnson County residents and visitors.

Additional Information

The floodplain mapping is complete and was adopted by FEMA on August 3, 2009. Johnson County floodplain mapping information can be found at the following locations:

If you have questions about the floodplain information or want additional information, contact the floodplain administrator for your community.