Floodplain engineering data

Available data

The engineering data from the Flood Insurance Studies can be found on the department Surface Water Data Viewer. If the effective model is not on the Surface Water Data Viewer, then staff can assist users in determining whether or not engineering data exists.

Staff can answer specific technical questions on studies related to the floodplain. For most engineering hydraulic studies, HEC-RAS is the accepted model. A free copy of HEC-RAS can be downloaded from the US Army Corps of Engineers.

DNR study review

Department of Natural Resources staff reviews engineering studies for compliance with NR 116 Wis. Admin. Code. A floodplain study checklist has been created to assist in preparing a floodplain study submittal to DNR for review. Please save this document locally and fill out digitally if possible, then include in your submittal package to DNR.

Hydrologic and hydraulic model revisions due to development should follow the local community's floodplain ordinance. Specifically, refer to section 7.1 (2) (c) of the model ordinance.

Federal Emergency Management Agency review

Users should contact the FEMA Map Information Exchange at 1-877-336-2627 or FEMAMapSpecialist@riskmapcds.com for questions related to Letter of Map Change submittals.