(Link to Metadata) This Topographically-defined Floodplain dataset is a high-resolution raster that communicates the extent and frequency of flood inundation along rivers that drain 2 square-miles or more in the Lake Champlain Basin, Vermont. This dataset represents the lateral extents of flooding for storms of recurrence intervals ranging from 2 to 500 years.  It includes eight modeled storm sizes (2, 5, 10, 25, 50, 100, 200, and 500 year peak floods) informed by regional regression analyses built from Vermont watershed characteristics and the historical hydrology of the region. The Floodplain dataset represents the flood inundation extents as they are topographically defined at the time of the most recent LiDAR data collection, which varies from 2013 to 2017.Because of simplifications made to represent hydraulic processes in the modeling approach and uncertainties and errors in large scale model parameterization (e.g., flood peak discharges at ungauged reaches, roughness values), there are limitations to its uses.This floodplain model is intended for planning and research use by government, academic, commercial and non-governmental agencies; it is NOT a substitute for FEMA Flood Insurance Rate Maps and is not intended for regulatory use.