SUMMARY SHOWING MONTHLY USE OF WATER BY SALT GRASS, TULES, CAT-TAILS, WILLOWS AND WIRE RUSH, AND EVAPORATION FROM WATER SURFACES, MAY, 1931, TO APRIL, 1932; IN 



TANKS AT SANTA ANA, CALIFORNIA ' • 



'Tanks Nor. 1 to 12. inclusive contain undisturbed soil. Tanks Nos. 13 to 15, inclusive, contain disturbed soil. 



' Wil!ow unhealthy and lost most of its leaves during latter part of the sumraer. 



'Tanks Nos. 1 to 15, inclusive, covered during rains prior to December 1, I93I. except during the first half of November, 1931. 



' Rainfall included in water used but changes in soil moisture on account of rainfall disregarded. 



' Not appplicable to field conditions. 



From December 1, 1931 to May 1, 1932. all tanks were exposed to rainfall. 



4503— Bet. pp. 52-53 



