88 



the crops. It is not known that similar estimates have been made 

 for other irrigated regions. Probably in only a few of them would 

 the figures be as impressive as in the Sacramento-San Joaquin 

 Delta where ground water is near the surface and subirrigation is 

 practiced. 



Northern Colorado Studies 



Grasses, aquatic plants, and weeds . --The Division of Irri- 

 gation, cooperating with the Colorado Agricultural Experiment 

 Station, carried on investigations of use of water by grasses, 

 aquatic plants, and weeds growing in tanks at Fort Collins, Colo., 

 during the growing season of 1929, 1930, 1931, and 1932 (23). A 

 brief summary of the results of the investigation is given in 

 Table 22. 



TABLE 22 



CONSUMPTIVE USE OF WATER BY GRASSES, AQUATIC PLANTS, 

 AND WEEDS AT FORT COLLINS, COLO., 1929-32 



overhang beyond confines of tank area. 



