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Flood control structures spared parts of Los Angeles County from destruction, while Orange and Riverside Counties experienced more damage. [15] The flood of 1938 is considered a 50-year flood. [16] It caused $78 million of damage ($1.69 billion in 2023 dollars), [16] making it one of the costliest natural disasters in Los Angeles' history. [17]
Considered a 100-year flood, [2] it was the worst flood in recorded history on nearly every major stream and river in coastal Northern California and one of the worst to affect the Willamette River in Oregon. It also affected parts of southwest Washington, Idaho, and Nevada. [1] [3]
A map of the flood area of the hypothetical ARkStorm event. The storm was not an unprecedented occurrence. Geologic evidence has been found that massive floods, of equal or greater magnitude to the 1861–1862 event, have occurred in California roughly every 100 to 200 years. [24]
"We looked at this in one case for the Napa River, and basically, your average annual winter storm could turn into the 100-year flood event if the ground is already saturated," he said.
Updated maps from Williamson County show an increase of 6,000 structures in the 100-year flood plains. The last information available was from 1994.
The Grand River went above bankfull on the night of March 24, rising slowly for the next four days. It broke the previous high-water mark by over 60 cm (2.0 ft), and was considered a once in 100 year flood. Over one-half of the population on the west side of the river was inundated. On the east bank of the river, numerous factories went underwater.
For river systems, a 100-year flood is generally expressed as a flowrate. Based on the expected 100-year flood flow rate, the flood water level can be mapped as an area of inundation. The resulting floodplain map is referred to as the 100-year floodplain. Estimates of the 100-year flood flowrate and other streamflow statistics for any stream in ...
Cities in Southern California are now feeling the aftermath of ... Drone footage shows historic flood damage in California desert. ... Cardinals RB James Conner signs 2-year deal worth reported ...