Base Flood is defined by the NFIP regulations. Flooding occurs for different reasons and at varying levels. All related data (flood levels, impacts, historical crests) were updated to reflect datum change. 2.3.5 Base Floods and Base Flood Elevations. Geological Survey (USGS) Data and Site Info for Corvallisĭatum was changed by 10 FEET in 2010. The datum used for base flood elevations will change January 2011 to North American Vertical Datum of 1988. Elevations are based on National Geodetic Vertical Datum of 1929. Older USGS topographic maps, MSL benchmarks The height in feet that the 100-year flood is expected to rise above sea level. Older USGS topographic maps, NGVD29 benchmarks Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps What is a base flood According to FEMA, it is a flood that. There is a 1 chance every year that flooding water will equal or exceed the BFE. A base flood elevation (BFE) represents the estimated (computed) height at which floodwater could rise in your area during a base flood. Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps BASE FLOOD ELEVATION: The BFE line indicates the highest predicted water level during a flood, measured by number of feet above the average high tide. The river is at bankfull level and may spill out of its banks at some locations between Harrisburg and Albany. Flooding of low areas of Hwy 34 and numerous roads in and near Corvallis begins.Įxpect flooding of some river island access roads and secondary roads east of Corvallis. What is a base flood According to FEMA, it is. At this and higher stages, the Willamette River between Harrisburg and Corvallis has historically been up to 3 miles wide.Įxpect flooding of low spots of Hwy 99 south of Corvallis, the Corvallis-Albany Hwy, and Hwy 34 near Corvallis.Įxpect extensive flooding of low-lying agricultural land east and south of Corvallis. A base flood elevation (BFE) represents the estimated (computed) height at which floodwater could rise in your area during a base flood. If you notice any errors in the below information, please contact our WebmasterĮxpect widespread flooding, with serious flooding possible between Corvallis and Albany on the west bank of the river. Is the approximate location based on the latitude/longitude coordinates
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