Why is Manhattan getting new flood hazard maps?
Flood hazard maps, also known as Flood Insurance Rate Maps (FIRMs), are important tools in the effort to protect lives and properties in Manhattan. They indicate the risk for flooding throughout Riley County and Manhattan. However, the current maps need to be updated as some areas were never mapped in detail, and other areas haven’t been re-mapped in more than 10 years. Through time, water flow and drainage patterns have changed dramatically due to surface erosion, land use and natural forces. The likelihood of riverine and low land flooding in certain areas has changed along with these factors.

New maps (found on this site as Preliminary DFIRMs) include the most current rainfall, elevation and other key data with the latest modeling technology to provide the most up-to-date picture of the area’s flood risk. The result: a better picture of the areas most likely to be impacted by flooding and a better foundation from which to make key decisions.

Show All Answers

1. What is a floodplain and how do I determine if my property is located in this area?
2. Why is Manhattan getting new flood hazard maps?
3. How might the new flood maps affect me financially?
4. How can I reduce the cost of flood insurance?
5. Who is responsible for updating the maps?
6. What is a Flood Insurance Rate Map?
7. What are the benefits of the new FIRMs?
8. How will the new FIRMs affect me?
9. What will happen if my property is remapped from a moderate- or low-risk area to a high-risk area?
10. What will happen if my property is remapped from a high-risk to a moderate- or low-risk area?
11. What does the new Homeowner Flood Insurance Affordability Act mean for me?
12. When do the new maps become effective?