76 



DIVISION OF WATER RESOURCES 



until January 29, 1931. Records were continued until March 1, 1933, 

 when the station was dismantled. 



PROCEDURE 



A general view of the moivst area above the Upper Narrows is 

 shown in Plate XI. The small flood channel on which the station is 

 located is designated by an X marked on the plate. About midway of 

 the length of this small channel, previously described, a section of the 

 swamp and an area of the adjacent higher ground were inclosed with 

 a fence for protection against animals. The bank is 4 to 5 feet higher 

 than the level of the swamp. The enclosure is approximately 20 feet 



PLATE XI 



MOIST AREA ALONG THE MOJAVE RIVER ABOVE THE UPPER NARROWS 

 NEAR VICTORVILLE, CALIFORNIA. 



by 64 feet and includes space in the swamp for the tule tanks, and 

 space on the bank for a tule tank, supply tanks, a ground water well, 

 and evaporation station equipment. The plan of the station is shown 

 in Plate XXL The equipment consists of three tule tanks, a standard 

 Weather Bureau evaporation pan, a four-cup anemometer, a set of 

 standard maximum and minimum thermometers and a thermograph 

 housed in a standard shelter, a rain gage, and a ground-water well. 



Previous investigations by Blaney and Taylor on consumptive use 

 of water by native vegetation along stream channels* indicate that if 

 data from tanks are to be used in estimating losses from larger areas 

 under field conditions, the tanks should be set in a field of natural 

 growth similar to that in the tanks. The native vegetation should 

 completely surround the growth in the tanks so that the exposure is 

 normal. Otherwise it is necessary to use large reduction factors the 



* "Bulletin No. 33, Chapter 4, "Rainfall Penetration and Consumptive Use of 

 Water In the Santa Ana River Valley and Coastal Plain," Division of Water 

 Resources, California State Department of Public Works. 



