What is the Johnson County 100 year floodplain? How does the floodplain affect my property?
The federal government requires mapping floodplains in counties nationwide to designate “100-year floodplains.” These are areas that have a one percent risk of flooding in any given year. The current FEMA regulatory maps were initially defined nearly 30 years ago and have had limited updating. Johnson County and its municipalities are working together to update FEMA regulatory floodplain maps throughout the County. These maps identify areas of risk where stormwater may create problems for the health and safety of residents and their properties today and in the future. The only completely accurate method of determining if your property is in the floodplain is to have a licensed land surveyor or engineer survey the property and compare the elevations with the existing defined flood elevations. The City’s Development Services and Public Works departments can only help identify whether or not a floodplain exists in the area.
