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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]
A USGS map shows flooded areas during the 1861–1862 event. The conditions built into the scenario are "two super-strong atmospheric rivers, just four days apart, one in Northern California and one in Southern California, and one of them stalled for an extra day". [5] The ARkStorm 1.0 scenario would have the following effects:
Beginning on December 24, 1861, it rained for almost four weeks. The largest flood in California's recorded history occurred from January 9–12, 1862. The entire Sacramento and San Joaquin Valleys were inundated for an extent of 400–480 km (250–300 mi), averaging 32 kilometres (20 mi) in breadth.
The flooding affected the indigenous peoples of California, in pre-industrial advancement populations. In addition to this event, geologic evidence indicates that other "megafloods" occurred in the California region in the following years A.D.: 212, 440, 603, 1029, c. 1300, 1418, 1750, 1810, and 1861–1862.
December 24, 1861 – February 1862 – The largest flood in California's history occurred, lasting for 45 days, reaching full flood stage in different areas between January 9–12, 1862. The entire Sacramento and San Joaquin valleys were inundated for 300 miles (480 km), averaging 20 miles (32 km) in breadth.
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April 20 – James D. Phelan, U.S. Senator from California from 1915 to 1921 (died 1930) April 23 – John Peltz, baseball player (died 1906) April 27 – William Lorimer, U.S. Senator from Illinois from 1909 to 1912 (died 1934) May 16 – Herman Webster Mudgett, alias H. H. Holmes, serial killer (died 1896)