WATER LOSSES PROM WET AREAS 



73 



determinations were not made until the winter of 1931-32, when it 

 became necessary to measure the change in water content in the soil 

 each month, due to soil moisture increases from rainfall. Determina- 

 tions were made fi'om samples taken from each foot of depth, using- a 

 new soil tube. The weight and volume of each sample was obtained 

 and apparent specific gravity computed by dividing the dry weight of 

 the sample in grams by its volume in cubic centimeters. 



There is considerable variation in the results and this may account 

 for some discrepancies in consumptive use by different soil tanks, 

 although the majority of values are close to the mean at each station. 

 Check determinations made at points outside the tanks agree with 

 those in the tanks. Values found in tanks containing disturbed soil 

 are somewhat less than those in undisturbed soil, as might be expected. 

 It will be noticed that the top foot of soil at San Bernardino has a 

 lower apparent specific gravity than the second or third foot. Results 

 of all apparent specific gravity determinations at both stations are 

 given in Table 27. 



TABLE 17 



APPARENT SPECIFIC GRAVITY OF SOILS IN TANKS AT SANTA ANA AND 



SAN BERNARDINO STATIONS 



