Surficial slope failures in southern California hillside residential areas: Lessons from the 1978 and 1980 rainstorms
P. M. Merifield, 1992. "Surficial slope failures in southern California hillside residential areas: Lessons from the 1978 and 1980 rainstorms", Landslides/Landslide Mitigation, James E. Slosson, Arthur G. Keene, Jeffrey A. Johnson
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Widespread damage in hillside areas of southern California resulting from major rainstorms during 1978 and 1980 focused attention on risks to life and property from surficial slope failures, including debris slides, debris flows, and debris floods. Both artificial and natural slopes underwent damaging surficial failures; however, mountain and foothill areas below burned watersheds were affected by considerably more debris than unburned areas. Slopes vegetated with grasses or other ground cover lacking deep root systems were particularly susceptible to failure.
Preventive measures include stricter enforcement of existing grading codes (includ-ing the requirement for a continuous cover of deep-rooted vegetation), stability analyses of surficial failures, regional studies by state and local governments to identify hazardous areas, site-specific investigations by consultants when properties change hands, and increased efforts to educate the public about slope maintenance in order to mitigate slope failures.
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Provides a variety of case histories, methodology to help identify, quantify, and mitigate landlsides, and legal cases affecting engineering geology. Part I provides basic information to aid in assessing geologic hazards related to compound landslides, surficial slope failures, and causes of distress to residential construction. Includes changes in the law relating to geologic investigations and disclosure of geotechnical information. Part II is a cross section dealing with recent significant landslides related to a single storm, intense rainfall, possible errors in the identification of and development on an existing or paleolandslide, and the use of pumping wells and horizontal drains to dewater slope failures. Also discusses how proper installation and use of drains prevent paleolandlsides from causing damage to modern facilities.