Effects on the Lithosphere


Natural land cover is disturbed as cities are built. This rapid development can result in very high levels of erosion and sedimentation in river channels. Additionally, as cities are paved, rain water is channeled from streets to the Boulder Creek. Since natural soil permiability is not available in an urban environment, more water is forced into the creek, resulting in higher, more swift, flow during heavy rain storms. This also speeds the erosion process and adds sediment.


Sandbags act as temporary erosion control for exposed tree roots along Boulder Creek

Exposed tree roots as a result of spring high water and small flash floods.

Streaming Quicktime Movie (click the image to play):

Construction along Boulder Creek adds sediment and erosion along river channel is increased

created 3/9/2002; last revised 5/1/2002 - Matt Kuhn & Andreas von der Dunk