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Bond Fire Debris Flows, California: January 25 and 28, 2021

February 16, 2021

A new geonarrative (Esri Story Map) summarizes the debris flows that were caused by a rainstorm following the Bond Fire in California.

On Wednesday, December 2, 2020 at approximately 10:15 PM PST, the Bond wildfire ignited in Orange County, California, burning partially within the Cleveland Forest, near Silverado Canyon just north of the area burned by the October 2020 Silverado fire. The fire burned 27 square kilometers (sq km) prior to containment on December 10, 2020 (CalFire). Rainfall events during the atmospheric river rainfall event in California during January 24, 2021 to January 29, 2021 triggered debris flows near Silverado in the Bond Burn area. Debris flows were observed and recorded in small watersheds near the northern burn perimeter, south of Silverado in White Canyon and in an unnamed canyon above Olive Drive.

View the Bond Fire Debris Flows, California - January 25 & 28, 2021 Geonarrative

topo map with shaded areas and lines following drainage channels
Map showing the location of three drainages where debris flows were observed (green stars) following the January 25 and January 28, 2021 storms. The map also displays the likelihood of debris flows (in %) at the scale of the drainage basin, and at the scale of the stream segment in response to a design storm with a peak 15-min rainfall intensity of 24 mm/h. Black outline is the boundary of the burn area, shaded areas show debris flow hazard levels, and lines indicate the drainage channels. (Public domain.)

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