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Most of the landslides that caused damage to manmade structures in the urbanized parts of Contra Costa County from 1950 to 1971 occurred on preexisting ancient landslide deposits. The ancient landslide deposits were reactivated as a result of grading, construction, the addition of water to slopes, or combinations thereof. Most of the landslides occurred during or immediately after storm periods in which more than 7 inches (18 em) of rain fell, particularly if the ground was already wet from previous storms. Amounts of rain required to generate abundant landslides are smaller in the spring than in the fall. The pattern of rainfall is more important than the total amount-long periods of relatively continuous rainfall produce more landsliding than short discrete storms separated by dry periods. Regional prediction of landsliding is possible if old landslide deposits have been correctly mapped, if accurate records of past landsliding have been kept, and if the sequence and amount of rainfall can be accurately forecast. Further development in the upland regions of Contra Costa County should be preceded by careful evaluation of the potential economic losses to the public from landslides that damage manmade

Influence of rainfall and ancient landslide deposits on recent landslides (1950-71) in urban areas of Contra Costa County, California