ArIZOX.V Ac.KICULTURAL EXPRRIMKXT Sl'.MIOX 



475 



TAHLli XIX. MOXTHLY VARIATION IX COMPOSI'IIO.X OF W.VTKR KKO.M 



THE TEMl'K DRAIXAGIC DITCH, PARTS PER 100,000 — ( 1!V C. X. C.\TLIX) 



Date 



1916 



June 25 



Julv 13 



Sept. 10 



Oct. 10 



Nov. 10 



Dec. 8 



1917 



Jan. 7 



Feb. 10 



Mar. 9 



Apr. 10 



May 10 



Jnne 10 



July 19 



Sept. 15 



Oct. 14 



Nov. 10 



Dec. 10 



Total 

 Solids 



Chlo- 

 rides 

 as NaCl 



Hardnes.s 

 (perma- 

 nent) 

 CaSO, 



Q) O 



CO- 



107.4 



27.2 



hJ) 



7.6 



5.4 



6.5 

 3.2 



' 7.6 

 7.6 



10.8 

 6.5 



32.6 

 Neutral 

 4.9 



ri 



67.2 

 66.4 

 60.3 

 64.0 



55.5 

 64.0 

 58.5 

 66.8 

 62.7 

 65.2 

 66.0 

 61.5 

 65.6 

 131.2 

 122.1 



Alka- 

 linity 

 Na^COi 



SO4 



3.4 



11.87 



172.53 

 64.76 



30.49 

 33.78 



Str. 



CaO MgO 



97.64 

 14.2 



12.6 

 14.6 



65.2 

 25.2 



17.57 

 15.75 



Mod. Str. 



Str. 



Mod. 



Mod. Str.lMod. Str, 



Slight 



Mod. 



Str. 



Mod. 



Mod. Str. 



Mod. 



Mod. 

 Mod. Str. 



Mod. 



SH«ht 



str. — Strong-. Mod. — Moderate. Mod. Str. — Moderatelj- strong. 



The ditch was completed early in 1917. thus the water for some, 

 months has not been affected in composition by the draina«^e of 

 new areas. All samples have been taken from near the outlet end 

 of the ditch. The season has been very dry and, consequently, the 

 composition has been changed but little by the runoff' of meteoric 

 water diluting the seepage ; nevertheless, great fluctuations in com- 

 position are noticeable. March 9 the water, which had hitherto 

 been hard, was alkaline, containing 3.4 parts per 100,000 of lilack 

 alkali ; but the following month, April 10, it was again found to be 

 as hard as it had been the previous November. The analysis made 

 in February seems to indicate that the permanent hardness of the 

 water was decreasing at that time. During the summer months 

 the hardness remained fairly constant, but increased three or four- 

 fold in September, then became neutral in October and again 

 strongly black alkaline in December, which is the last analvsis 

 available. 



The total solids dissolved in the water and the chlorides show 

 similar fluctuations. September 15 both total solids and chloride 

 reached a maximum, but dropped abruptly to about one-half that 

 amount in October. This period of high solids and chlorides was 



