Mudflows occur on steep slopes where vegetation is not sufficient to prevent rapid erosion, but can occur on gentle slopes if other conditions are met. other factors are heavy precipitation is short periods and an easily erodible source material.
Mudflows can be generated in any climatic regime, but are most common in arid and semiarid areas. They may rush down a mountainside at speeds as great as 100km (60miles) per hour and can cause great damage to life and property. Boulders as large as houses have been moved by mudflows
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