Floodplains & Models
Looking for reference information about flooding?
Clean Water Services has worked with the Federal Emergency Management Services and Washington County to conduct a re-study of the floodplain in Washington County. The models referenced here represent the best available information on the floodplain's location, water surface elevation, and cubic feet per second of peak stream flows, and are currently undergoing an approval process through FEMA. Until the models are accepted by FEMA, they are not final, but remain the best available information.
This data was created for the floodplain update project and was submitted to FEMA on 3-3-06. While these maps may help developers and others locate floodplains, they are not to be used to determine whether property owners need flood insurance. Only FEMA has that information at www.fema.gov. FEMA also has floodplain data on areas outside the Urban Growth Boundary.
The models are developed for use by engineers and can be viewed by obtaining free software, HEC-RAS or HEC-HMS, from the US Army Corps of Engineers. Others may wish to view maps or obtain GIS data and may do so by viewing the Watershed Data Catalog and clicking on 100-Year Floodplain, or Cross Sections with Water Surface Elevations.
Hydrology & Hydraulics Models contain projected 2, 5, 10, 25, 50,100, & 500 year flows.