Preliminary, revised floodplain maps are available for several Austin watersheds. We periodically restudy creeks to ensure accurate floodplain maps, which help us prepare for and communicate the risks of flooding.
FEMA has approved the revised floodplain maps for the creeks listed below. The City of Austin will adopt the maps in January 2016, when they will become effective for flood insurance purposes. Austin is already using them for development purposes.
The following creeks were selected for the revised floodplain mapping because the existing maps were either incomplete or based on outdated information and computer models.
There are three ways the study affects properties in these watersheds:
Approximately 2,200 properties are no longer considered to be in the floodplain. This may include the whole property, the structure or just a portion of the property.
Approximately 2,400 properties are now considered to be in the floodplain. As above, this may include the whole property, the structure, or just a portion of the property.
In addition, flood depths may have changed for the thousands of properties that remain in the floodplain. Changes in depth are not uniform along the length of the creeks.
September 2013– Public Meetings
Public meetings were held.
August to November 2014 – Appeal and Comment Period
Two appeals were received and processed.
July 2015 – Letter of Final Determination
FEMA sends a Letter of Final Determination to impacted communities. The letter states that new or updated floodplain maps will become effective in six months and that the community must adopt them by the effective date to remain participants in good standing in the National Flood Insurance Program.
January 2016 – Map Effective Date
New floodplain maps will become official for flood insurance purposes. The revised floodplains are already being used to regulate development.
To receive email updates on this project, please send us an email and ask to be included in the updates.