Area	Lower Noyo/Basin-wide
Topic	Sediment: Matthews Estimate of Contributions to Mass Wasting 1933-1999

 

Caption:  Matthews (1999) estimated sediment yield from mass wasting in the Noyo Basin using aerial photos and found the trends shown above. Landslides in the earliest photos were predominantly in forests (86%) as opposed to areas recently harvested (within 15 years), while roads caused no landslides but the railroad bed was responsible for 12% of mass wasting. With increased timber harvest and road building in recent periods, these factors have increased in relative importance as triggers of mass wasting. Data treatment patterned after Matthews (1999) Sediment Source Analysis and Preliminary sediment Budget for the Noyo River.

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