Name: Tsunami Inudataion Line

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Description: This digital tsunami inundation line is a combination of the original 56 quadrangle-based lines released as separate open file reports. This line has gaps at various points where the tsunami inundation hazard was judged to have such low risk that specifying an inundation zone for the purposes of the legislation was unnecessary. Tsunami effects in these areas, if any, would likely be channel bank splash and higher than normal currents for the waterways involved. The purpose of Senate Bill 379 was not to map all possible tsunami inundation, but to show areas, especially dry land areas, that have a reasonable risk of tsunami damage to critical and essential facilities. The original hardcopy maps were prepared to implement public safety laws (ORS 455.446 and 455.447), and are not intended for land use or emergency planning. Citation of the Oregon Department of Geology and Mineral Industries would be appreciated. This figure is the map accuracy standard for the U.S. Geological Survey 7½' topographic map series, which was the base map used for plotting the tsunami inundation boundary. 2.4.2.2.1 Vertical Positional Accuracy Value: The maximum vertical positional error is one contour interval on the corresponding U.S. Geological Survey 7½' quadrangle base map. 2.4.2.2.2 Vertical Positional Accuracy Explanation: This figure varies depending on contour interval for the respective U.S. Geological Survey quadrangle. Contour intervals of the corresponding USGS base maps range from 20 to 50 feet.

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