Floodplain Line

Mississippi Valley Conservation Authority Floodplain Line

Polyline Shapefile

Projected NAD83 Zone18N

A floodplain is an area, generally along a stream or watercourse, that is subject to flooding. The regulatory flood standard for the Mississippi Valley watershed is a 1:100 year flood event.  Floodplain maps are produced using a science-based method of field surveys and computer models. Background data is gathered on: land use; topography; stream flow; and precipitation. Field surveys collect information on local infrastructure (culverts, bridges, etc.). Data is then entered into computer models to calculate stream flow and water levels. Review of technical work and modelling is completed to finalize the floodplain map.

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