114 



DIVISION OP WATER RESOURCES 



The averag-e rate of use of water ])er acre of canyon bottom fill 

 between the middle and lower controls in 1932 was 0.42 acre-inch per 

 day during July, 0.44 acre-inch per day during August, 0.37 acre-inch 

 per day during September, and 0.26 acre-inch per day during October. 

 Between the upper and middle controls, the average rate of use of 

 water per acre of canyon bottom fill was 0.33 acre-inch per day during 

 July, 0.35 acre-inch per day during August, 0.30 acre-inch per day dur- 

 ing September, and 0.20 acre-inch per day during October. In the 

 upper section, each 1000 feet of canyon has one acre of canyon bottom 

 fill. 



Loss from Stream Above the Highest Control 



The highest control on the stream during the 1931 season was the 

 control which later was called the middle control. During the 1932 

 season the upper control was the highest control on the stream. 



The losses indicated by the daily cycle in the discharge curves 

 at the middle control in the 1931 season and at the upper control in 

 the 1932 season were evaluated in the following manner. The actual 

 volume passing the control was subtracted from that volume which 

 would have passed the control had a sustained flow occurred throughout 

 the day equal to the average of the maximum flow on the day considered 

 and the maximum of the next succeeding day. This value does not 

 represent all of the loss by evaporation and transpiration occurring 

 in the canyon bottoms above the control. It may, however, be con- 

 sidered as a fair approximation of the loss that might be reclaimed most 

 readily by carrjang the water down the main canyon in pipes. Table 

 40 shows the amount of water during the days of record in 1931 that 



TABLE 40 



DAILY LOSS OF WATER FROM THE STREAM INDICATED BY DIPS IN DISCHARGE 

 CURVE AT MIDDLE CONTROL IN COLDWATER CANYON 



August 1, to October 17, 1931 



•Portion of day only. 



