kS 



above the Santa Ana station. The plot was in a level field at 

 some distance from buildings and had good exposure. Climatic 

 conditions represent those of the interior portion of southern 

 California. Summers are long and hot. Winter temperatures are 

 lower than in the valley at Santa Ana, and rainfall is greater. 

 Records of temperature, wind, and rainfall are shown in Table 6. 



Soil in the experimental tanks, classified as Chino silt 

 loam, was taken from the station grounds. Ground water was with- 

 in a few feet of the surface, yet there was no indication of al- 

 kali in the tanks after 2 years of operation. The station re- 

 ceived artesian water from the city supply. Tanks in which Ber- 

 muda grass was grown were set in a large field of the same growth 

 to provide normal surroundings. 



As a part of the Santa Ana investigation, four tanks at 

 San Bernardino were filled with undisturbed soil in which was 

 growing a good Bermuda grass cover with fully developed root 

 systems. In two tanks, the water table was maintained at a depth 

 of 2 feet and in the other two at 3 feet, the water table being 

 regulated by Mariotte apparatus. Grass growth was dense and 

 several inches high. 



The average annual depth of water used by the Bermuda grass 

 having water table 2 feet from the tank surface was 34.37 inches, 

 while those having table at 3 feet used 28.19 inches, which does 

 not differ greatly from the water used by saltgrass. Monthly data 

 on consumptive use of water by Bermuda grass are given in Table 7. 



Tules and cattails . --The round-stem tule or common bulrush 

 is a perennial plant with a round dark green stem growing to 

 heights of 6 to 10 feet. It grows densely in shallow water along 

 stream channels, in swamps, and drainage ditches. The triangular 

 bulrush ( Scirpus olneyi ) is also an aquatic plant. Its stems are 

 three-cornered and grow often to heights of 6 feet or more. Cat- 

 tail, sometimes classed with tules and of similar height, is a 

 perennial marsh plant with flat leaves and cylindrical head which 

 is filled with thousands of small cottony seeds. 



