382 



BRIGGS AND BELZ: INFLUENCE OF HAZE 



fluenced by a number of other factors, such as temperature, 

 cloudiness, humidity, and wind velocity. In any comparison of 

 this kind one would, therefore, expect to encounter anomalies 

 in the records from an individual station resulting from these 

 disturbing factors (see Table III). 



The evaporation records are based upon daily measurements 

 of the change in elevation of a free water surface, after correct- 

 ing for precipitation. The evaporation tanks are either 6 or 8 



TABLE I 



Normal Evaporation at Stations in the Great Plains and Intermountain 



Districts 



STATIONS 



Amarillo, Tex 



Dalhart, Tex 



Garden City, Kans... 



Hays, Kans 



Akron, Col 



North Platte, Neb.... 



Newell, S. Dak 



Edgeley, N. Dak 



Dickinson, N. Dak... 

 Williston, N. Dak.... 

 Judith Basin, Mont... 



Nephi, Utah 



San Antonio, Tex 



Fallon, Nev 



Yuma, Ariz 



Sn 



NO. OP 



YEAB3 



OBS. 



5 

 4 

 4 

 5 

 4 

 5 

 4 

 5 

 5 

 3 

 3 

 4 

 5 

 4 

 3 



APRIL 



MAT 



inches 



7.55 

 7.89 

 7.61 

 6.85 

 5,43 

 6.05 

 4.81 

 3.89 

 4.08 

 4.72 

 4.10 

 4.80 

 5.93 

 •6.20 

 8.34 



88.25 



inches 



9.09 

 9.73 

 8.76 

 7.26 

 6.91 

 6.75 

 6.49 

 4.87 

 5.03 

 6.11 

 5.40 

 7.21 

 6.57 

 8.34 

 10.92 



109.44 



JUNE 



1-15 



inches 

 5.22 

 5.70 

 4.63 

 4.24 

 4.10 

 3.72 

 3.44 



24 

 55 

 79 

 86 

 25 

 44 

 91 

 92 



61.01 



JUNE 



16-30 



JULY 



inches 



5.54 

 6.25 

 5.51 

 4.61 

 4.43 

 4.79 

 4.53 

 3.42 

 3.65 

 4.04 

 3.25 

 4.82 

 4.83 

 4.99 

 5.59 



70.25 



inches 



9.68 



10.56 



10.00 



9.09 



9.36 



8.50 



9.23 



6.91 



7.34 



7.92 



7.61 



9.67 



9.61 



11.05 



11.33 



AUGUST 



137.86 



inches 



9.06 

 10.04 

 9.35 

 8.82 

 8.61 

 7.74 

 7.53 

 5.88 

 6.31 

 6.24 

 6.94 

 9.23 

 9.55 

 10.05 

 11.10 



SEPT. 



TOTAL 



Apr.l to 

 Oct. 1 



126.45 



inches 



8.00 

 8.26 

 7.69 

 6.96 

 6.85 

 6.44 

 5.54 

 4.31 

 4.28 

 4.11 

 4.86 

 6.13 

 7.24 

 6.14 

 8.19 



95.00 



inches 



54.14 

 58.43 

 53.55 

 47.83 

 45.69 

 43.99 

 41.57 

 31.52 

 33.24 

 35.93 

 35.02 

 46.11 

 48.17 

 51.68 

 61.39 



feet in diameter, and 2 feet deep, and are sunk in level ground in 

 a freely exposed space to within 4 inches of the top, the water 

 level being maintained at approximately 4 inches below the top 

 of the tank. 



At most of the evaporation stations, ''normals" based upon at 

 least four years records, exclusive of those of 1912, are now avail- 

 able. The monthly normal evaporation, from April to Septem- 

 ber inclusive, for 15 stations located in the great plains and in- 



