The Behavior of Rivers 



43 



The coast of California has but recently been lifted by earth 

 crustal movement above sea level. Along a narrow belt border- 

 ing the sea there is land that is akin to the ideal continent that 

 has been described. North and south of San Francisco Bay 

 raised beaches, in many places marked by wave-cut terraces, 

 show that the land has but recently been raised above sea level. 

 Short streams have developed, pushing their heads landward in 



Courtesy Los Angeles Flood Control Commission 



FIG. 13. Cucamonga Creek, Los Angeles County. Dam designed to 

 spread the water in time of flood. 



