WATER LOSSES F^ROM WET AREAS 



81 



Plate XV-A is a general view of the station taken October 31, 1931, 

 showing the location of the cliniatolopieal apparatus, while Plate XV-B 

 shows the location of Tanks Xos. 2 and 3, in the swamp, where they are 

 surrounded by natural swamp growth. Plate XVI, taken on the same 

 date, shows the tule growth in Tank No. 1. 



CONSUMPTIVE USE OF WATER 



Table 28 records, by months, for the period from February 1, 1931, 

 to February 28, 1933 ; the evaporation from a standard Weather Bureau 

 pan ; the consumptive use of water from tule Tanks Nos. 1, 2, and 3 ; 

 a percentage comparison of the consumptive use of water from the 

 tule tanks expressed in per cent of the evaporation ; the wind move- 

 ment ; the rainfall ; and average daily maximum and minimum tempera- 

 tures. A comparison of the losses, from February, 1931, to February, 

 1932, from the three tule tanks and from the evaporation pan is shown 

 graphically in Plate XVII. 



PLATE XVII 



60 



C 01 





30 



Or 20- 



O'T 



Q-O) 



10- 



DIM 



m 



Feb. 1 M ar. Apn , May Jui'^g ; July Aug. |Sept. j Oct. ) Nov. | Dec. 







Standard Weather Bureau Fi 



evaporation pan 4ft in diameter:[j 



-Tank No I, Two ft. in diameter, 

 located on bank. 



Tank N^Z, Two ft. in diameter; 

 located in swamp. 



Tank N03, Six ft. in diameter, 

 located in swamp. 



1931 



'"1 \~m7inrr^M~h^M~y^ 



Jan. 



Feb. 



1932 



MONTHLY EVAPORATION AND USE OF WATER FROM TANKS NO. 1, NO. 2. 

 AND NO. 3, FEBRUARY, 1931-FEBRUARY, 1932. 



In April the tules in Tank No. 1, located on the bank, began to 

 use water at a relatively high rate that increased rapidly until the 

 highest use Avas reached in July, when it amounted to 4.55 times the 

 evajioration, or 55.83 acre-inches per acre. After reaching a peak in 

 July and August the use dropped until the plants were killed by 

 frost in November, after which there was a continued loss by evapora- 

 tion. There was practically no green growth in this tank until May, 

 1932, as indicated in Table 28, the use being shown to be much less than 

 the evaporation from the AVeather Bureau pan in March and April. 

 After the tules .started to grow in 1932 they used Avater rapidly until 

 the highest use was reached in August, when it amounted to 78.99 

 acre-inches per acre, which was 6.77 times as great as the evaporation 

 from the Weather Bureau pan. 



The use of water from tule Tank No. 2, located in the swamp, was 

 found to be considerably less than that from Tank No. 1 as the growing 

 season advanced, although the tanks were of the same diameter. In 



6 — 4503 



