MASS WASTING. SURFICIAL PROCESSES. Erosion, Transportation, Deposition on the Earth’s Surface Landscapes created and destroyed Involves atmosphere, water, gravity Agents: Mass wasting (gravity), Running water (streams), glaciers (ice), wind, water waves, ground water. MASS WASTING.
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The dam stood 180 feet high and 600 feet long
Curved Concrete Structure
On March 12, 1928, after its reservoir reached full capacity for the first time, the St. Francis Dam began to leak. At 11:57 PM, the dam collapsed, sending 12 billion gallons of water raging through the narrow San Francisquito Canyon into the Santa Clara Valley. Designed and built two years earlier by William Mulholland to store water brought by the Los Angeles Aqueduct from Owens Valley. Its failure resulted in a flood which killed over 450 people and destroyed buildings, bridges, railroads, and farms. The St. Francis was only one of 19 dams that Mulholland had constructed to store Los Angeles' water supplies.
Fresh sediment deposited in debris retention structure along the range front of the San Gabriel Mountains.
Recent large landslide covering road in the foothills of the San Gabriel Mountains
Debris flow that initiated from large landslide above the town of La Conchita. Debris-flow source is from large 1995 landslide.
Small, recent shallow landslides in older scars from previous years, east of I-5 in Orange County.