Flooding in Wyoming at Yosemite - Could it Happen in Los Angeles

 The National Weather Service reported that The Yellowstone River at Corwin Springs crested at 13.88 feet (4.2 meters) Monday.

The previous record of 11.5 feet (3.5 meters) was set in 1918

Yellowstone got 2.5 inches (6 centimeters) of rain Saturday, Sunday and into Monday.

Rain through midweek along with rapid snowmelt has caused rivers to swell.

Zone Area Forecast for Yellowstone National Park (weather.gov)

Compare 1862

The Great Flood filled the Central Valley of California with water, bankrupting the State of California.

The population of Los Angeles was less than 15,000 people. with cattle grazing the dominant use of land at that time.

The Santa Ana River moved five miles, an entirely new pathway was created from Anaheim to the Pacific Ocean.

Even as developed with waterways, dams, and cemented river paths; it is questionable if it could contain a flood of the same magnitude as that which came through the area in 1862. In fact according to LARiver.org the cost of creating riparian corridors is prohibitive now. They explain:

"Within the 32-mile Los Angeles River project area, the only areas that presently support riparian habitat are Sepulveda Basin and the Glendale Narrows. These areas are increasingly stressed by exotic species, hydrologic modifications, dumping of trash and debris, and encroaching development." 

"Brett Sanders from the University of California, Irvine and Stanley Grant, from Virginia Tech, have explained the possible hazard associated with flooding in Southern California in their article appearing in the journal WIRES-Water

Re‐envisioning stormwater infrastructure for ultrahazardous flooding - Sanders - 2020 - WIREs Water - Wiley Online Library

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