120 



DIVISION OF WATER RESOURCES 



TABLE 45 

 PRECIPITATION 1931-32 SEASON 



' No record prior to October IS, 1931. 



3000 feet. Probably more rainfall was received at the higher eleva- 

 tions and water percolating downward from the higher areas found 

 its way into the channels in which the flow was observed. There was no 

 further rain of importance after February 19 and three weeks later 

 all of the channels had dried up and there was no more flow in them 

 during the season of 1931-32. 



It therefore appears that the soil mantle on the slopes to the left 

 of the line A-B had sufficient capacity to intercept and hold all of the 

 rain that fell during the 1931-32 season. This amounted to at least 

 24.39 inches as recorded at Arrowhead Springs Hotel, and in the 

 19-day period from February 1 to February 19, 11.55 inches fell. It 

 may appear rather astonishing that this large amount of rain coming 

 ■\\dthin a period of 19 days at the end of the 1931-32 rainy season, was 

 held without storm run-off by the soil mantle to the left of the line 



PLATE XXXI 



EAST SLOPE OF ARROWHEAD MOUNTAIN DRAINING INTO COLDWATER 



CANYON. 



