COLORADO IRRIGATION WATERS AND THEIR CHANGES. 29 
TABLE XII—ANALYSIS OF WATER AS IT FLOWED ONTO 
PLOT JULY 8 AND 9, 1898. 
Analytical 
Per 
Grs. 
Imp. 
Results. 
Cent. 
Gal. 
Silicic Acid_ 
_ 1.885 
0.942 
Sulfuric Acid _ __ 
_ 40.389 
20.195 
Carbonic Acid_ 
. 9.245 
4.622 
Chlorin_ ___ 
_ 3.479 
1.740 
Sodic Oxid. _ 
. 13.149 
6.575 
Potassic Oxid_ 
. 0.859 
0.429 
Calcic Oxid.._ 
. 21.160 
10.580 
Magnesic Oxid 
6.900 
3.450 
Ferric and Alu. Oxids 0.077 
0.039 
Manganic Oxid .. 
0.058 
0.029 
Ignition . _ _ 
3.256 
1.628 
Sum.. 
.100.462 
50.229 
Oxygen Equiv. to 
Chlorin __ 
1.784 
0.392 
Total . _ 
_ 99.678 
49.837 
Grs. 
Per 
Imp. 
Combined. 
Cent. 
Gal. 
Calcic Sulphate_ 
51.366 
25.683 
Magnesic Sulfate __ 
15.272 
7.636 
Magnesic Chlorid __ 
4.296 
2.148 
Potassic Chlorid ... 
0.567 
0.284 
Potassic Carbonate 
0.735 
0.367 
Sodic Carbonate __ 
21.728 
10.864 
Sodic Silicate_ 
0.851 
0.426 
Ferric and Alu. 
Oxids __ . __ 
0.077 
0.039 
Manganic Oxid... . 
0.058 
0.029 
Ignition_ _ 
3.261 
1.631 
Sum . _ 
98.211 
49.107 
Excess Silicic Acid 
1.466 
0.733 
Total __ 
99.677 
49.840 
Total solids 50.0 grains per imperial gallon. 
TABLE XIII.—ANALYSIS OF WATER AS IT FLOWED OFF AT 
MIDDLE OF NORTH SIDE OF THE PLOT JULY 14, 1898.* 
Grs. 
Grs. 
Analytical 
Per 
Imp. 
Per 
Imp. 
Results. 
Cent. 
Gal. 
Combined. 
Cent. 
Gal. 
Silicic Acid_ 
_ 1.079 
0.791 
Calcic Sulfate_ 
29.729 
21.791 
Sulfuric Acid_ 
46.877 
34.361 
Magnesic Sulfate 
22.064 
16.173 
Carbonic Acid. 
. 2.895 
2.122 
Potassic Sulfate ___ 
2.534 
1.857 
Chlorin_ 
4.288 
3.143 
Sodic Sulfate. _ 
24.018 
17.605 
Sodic Oxid,___ 
19.419 
14.234 
Sodic Chlorid _ 
7.076 
5.187 
Potassic Oxid . 
. 1.376 
1.009 
Sodic Carbonate.. 
6.981 
5.117 
Calcic Oxid_ 
12.247 
8.977 
Sodic Silicate 
2.138 
1.567 
Magnesic Oxid_ 
. 7.353 
5.390 
Ferric and Alu. 
Ferric and Alu. 
Oxids ... ... _ 
0.047 
0.034 
Oxids ___ 
0.047 
0.034 
Manganic Oxid_ 
0.107 
0.078 
Manganic Oxid_ 
0.107 
0.078 
Ignition __ 
5.135 
3.764 
Ignition _ 
. 5.135 
3.764 
— 
— 
— 
— 
Sum .. 
99.829 
73.173 
Sum.._ 
100.823 
73.903 
Excess Silicic Acid 
0.026 
0.019 
Oxygen Equiv. to 
Chlorin ... . _ . 
. 0.966 
0.708 
Total __ 
99.855 
73.192 
Total_ 
99.857 
73.195 
Total solids 73.3 grains per imperial gallon. 
* It was an accident that enabled us to obtain this sample of run¬ 
off water. The water at our disposal for irrigating was not sufficient to 
produce any off-flow, but we, by an oversight, left our dam in the ditch 
and our distributing gates open. On the night of the 13th there was a 
heavy shower in the foot hills and others also having left their ditches 
open we obtained water enough to produce a slight off-flow. It is plain 
that the water which came down thus unexpectedly was storm water 
and was mixed with the water which we had previously been using for 
irrigation. The actual result was larger than is presented by the an¬ 
alysis. The volume of this off-flow was small and continued for a short 
time only. 
