COLORADO IRRIGATION WATERS AND THEIR CHANGES. 25 
TABLE XI.—ANALYSIS OF SAMPLE OF WATER TAKEN FROM 
WINDSOR RESERVOIR, AUGUST 5, 1902. 
Grs. 
Grs. 
Analytical 
Per 
Imp. 
Per 
Imp. 
Results. 
Cent. 
Gal. 
Combined 
Cent. 
Gal. 
Silicic Acid... _ __ 
. 0.380 
0.264 
Calcic Sulfate... _ 
. 32.202 
22.348 
Sulfuric Acid .. _ 
. 50.149 
34.803 
Magnesic Sulfate _ 
_ 37.258 
25.857 
Carbonic Acid... . 
. 3.854 
2.675 
Potassic Sulfate _. 
. 1.000 
0.694 
Chlorin . . __ 
. 1.890 
1.312 
Sodic Sulfate_ 
. 10.581 
7.343 
Sodic Oxid . _ 
. 12.109 
8.404 
Sodic Chlorid_ 
_ 3.119 
2.165 
Potassic Oxid 
0.541 
0.375 
Sodic Carbonate . 
9.294 
6.446 
Calcic Oxid.. ... 
. 13.254 
9.198 
Sodic Silicate _ . . 
. 0.770 
0.534 
Magnesic Oxid. 
. 12.475 
8.658 
Ferric and Alu. 
Ferric and Alu. 
Oxids ....... 
. 0.289 
0.201 
Oxids __ ... 
. 0.289 
0.201 
Manganic Oxid ... 
. 0.070 
0.049 
Manganic Oxid 
0.070 
0.049 
Ignition ... 
_ [5.415] 
3.758 
Ignition_ 
. [5.415] 
3.758 
— 
— 
Sum 
.100.000 
69.395 
Sum_ _ 
.100.426 
69.697 
Excess... 
None 
None 
Oxygen Equiv. to 
— 
Chlorin_ 
_ 0.426 
0.296 
Total .... 
.100.000 
69.395 
Total_ 
.100.000 
69.401 
Total solids, 69.4 grains per imperial gallon. 
SANITARY ANALYSIS. 
Parts Per Million. 
Total Solids_991.430 
Chlorin_ 27.730 
Nitrogen as Nitrates_ 0.100 
Nitrogen as Nitrites_ 0.001 
Parts Per Million. 
Saline ammonia_ 0.040 
Albuminoidal ammonia_ 0.360 
Oxygen consumed_ 3.634 
§ 45. We have in this case, as in that of Terry lake, and in 
the others to a less degree, a very noticeable increase in the amount 
of total solids. Taking the capacity of this lake as 14,000 acre- 
feet (14,004 is the correct capacity) we find that there are 
18,894.15 tons of salts held in solution, while a like quantity of 
Poudre water would contain only 789.5 tons, showing 18,104.6 
tons collected by the lake during the period intervening between 
the two drawings-off—a period of approximately a year. The 
capacity of Terry lake is 9,000, that of Windsor lake 14,000 acre- 
feet. Terry lake collected 27,127 tons, and Windsor lake 18,894 
tons, of mineral matter in a year. The amount of these salts is 
very different, the smaller lake or reservoir having collected one- 
half more than the larger one. 
§ 46. The relative quantities of the various salts are also 
quite different in these cases. For instance, Terry lake collected 
5,859.4 tons of calcic sulfate, anhydrous; Windsor lake, 6,083.29 
tons. Terry lake collected 10,616.4 tons of magnesic sulfate; 
Windsor lake 7,029.58 tons. Of sodic sulfate, Terry lake collect¬ 
ed 7,113.78 tons; Windsor lake, 1,999.19 tons. Of sodic carbonate 
Terry lake collected, average of two years, 2,069.25 tons; Windsor 
