Floodplain Mapping Projects

FEMA has available several services for different phases of a mapping project. Preliminary, Pending and Effective products can be downloaded on from the Map Service Center. FEMA also maintains several map viewers:

National Flood Hazard Layer - displays the effective digital data
> Flood Map Changes Viewer  - includes the Preliminary and Pending digital map data, with a Changes Since Last FIRM layer that compares the Preliminary/Pending data with the effective data


KDA maintains project-specific map viewers for active projects that are based on the same digital data. The web links are included on the project pages below. 

Walnut Custom Watershed


The Walnut Custom Watershed Floodplain Mapping update project kicked off on December 12, 2019, in El Dorado and Winfield. The Discover Meeting was held March 4, 2020, in El Dorado and Arkansas City. Enhanced data development is anticipated to begin in 2022 for the areas that will undergo a regulatory update.  This website will be updated with relevant content as the project moves forward.


Watershed Discovery Information

Walnut Discovery Meeting Presentation (El Dorado) 3-4-2020

Walnut Discovery Meeting Presentation (Arkansas City) 3-4-2020

Walnut Custom Watershed Kickoff / Initial Map Review 12-12-2019

Walnut Kickoff Meeting Handout - El Dorado

Walnut Kickoff Meeting Handout - Winfield

Walnut Kickoff Notes - El Dorado 12-12-2019

Walnut Kickoff Notes - Winfield 12-12-2019

Community Maps - Initial Map Review 12-12-2019


Butler County

Butler County Scoping Map


Cowley County


Cowley County Scoping Map



Unsure which watershed you are in?  Use the following link to find out.
Kansas HUC 8 Watershed Map

Or reference the map below for Custom Watershed project areas.

Project Reference Map

Use this page to find relevant information on floodplain mapping projects.  Click on the map below to view current or proposed floodplain mapping projects.  Use the Kansas Floodplain Map Viewer for current effective floodplains.

Project Status Map (updated December 4, 2020)