100 



stations, a Weather Bureau evaporation pan provided data for 

 comparison with consumptive use records. 



The 12-month use of water by saltgrass, approximately 

 40 inches in depth, was slightly more than the amount determined 

 at Isleta in spite of greater depth to water table, and approxi- 

 mated results obtained in southern California under similar tank 

 conditions. Thus, in widely separated localities, consumptive 

 use by saltgrass, growing under conditions of ground water within 

 approximately 12 inches of the surface, appears not to exceed 

 40 acre-inches per acre. There are probably few extensive local- 

 ities where such conditions exist. For this species, at least, 

 consumptive use decreases with increasing depth to ground water, 

 so that the annual draft on water supplies caused by saltgrass 

 is probably less than would be required by many cultivated crops 

 in the same area. 



