WATER LOSSES FROM WET AREAS 



119 



TABLE 44 



COMPARISON OF LOSS OF WATER FROM ATMOMETERS, EVAPORIMETER, AND LOSS 

 OF WATER BETWEEN MIDDLE AND LOWER CONTROLS 



September 8-14, 1932 



The daily maximum and minimum temperatures of the water, both 

 in the stream and in the evaporation pan sunk in the stream, and the 

 daily maximum and minimum air temperatures in the canyon are given 

 in Table 34. 



YIELD OF WATER FROM DRAINED SLOPES ON ARROWHEAD 



MOUNTAIN 



During the last mile of its course, Coldwater Creek skirts the east 

 slope of Arrowhead Mountain, which may be identified in Plate XIX 

 by the natural outline of an arrowhead on the southwest face of the 

 mountain. The cutting of the main canyon has proceeded more rapidly 

 than that of the side canyons so that the side canyons drop off on a 

 very steep grade as they enter the main channel. This has left excellent 

 bedrock exposures at the lower ends of many of the side canyons and 

 there was therefore an opportunity to observe the yield of water from 

 the drained slope above these bedrock exposures. 



Plate XXXI is a vieAv of the east slope of Arrowhead Mountain 

 taken from a point across Coldwater Canyon on the divide between 

 that canyon and Strawberry Canyon. The elevation of the trail shown 

 at the bottom of the view is approximately 2300 feet and of the moun- 

 tain peak 3510 feet. 



Seasonal rainfall records for 1931-32 to February 19 are given 

 in Table 45. On February 19, 1932, each side canyon was explored 

 for evidence of water flowing in its bed. No evidence of any yield 

 of water was found in any of the canyons to the left of the point 

 marked A in Plate XXXI. To the right of the point marked A, 

 every channel had flowing water in it. It may be noted from Plate 

 XXXI that there is a marked change in the density of the vegetation 

 to the right of the line marked A-B. To the right of this line, the 

 vegetation is less dense and there are more rock outcrops than to the 

 left of the line. The elevation of the point marked B is approximately 



