20 
BULLETIN 82. 
Poudre river, the other sources being seepage and storm water 
from Dry Creek, and seepage and drainage from the adjacent 
country. Some years these latter furnish a considerable part of 
the 9,000 acre-feet contained in this reservoir. While this state¬ 
ment is true as to the amount of water furnished, it seems very 
probable that these sources always furnish an unusually large 
amount of soluble salts. The Little Cache la Poudre ditch, which 
carries water from the Poudre river to the reservoir, is a compar¬ 
atively short ditch and can scarcely collect more than a small part 
of the salts which we shall presently find contained in the water 
of the reservoir. The two analyses given below are of samples 
taken from near the center of the lake and several feet below the 
surface, just before the water was drawn out, the reservoir being 
full. The water was slightly yellow and had a slight odor. 
TABLE VI I—AN A LYSIS OF WATER FROM THE LARIMER & 
WELD RESERVOIR (TERRY LAKE). SAMPLE 
TAKEN JULY 28, 1900. 
Analytical 
Per 
Grs. 
Imp. 
Results. 
Cent. 
Gal. 
Silicic Acid _ 
_ 0.125 
0.168 
Sulfuric Acid _ 
_ 48.089 
64.680 
Carbonic Acid_ 
. 4 727 
6.358 
Chlorin _ 
_ 0.982 
1.321 
Sodic Oxid 
14.935 
20.087 
Potassic Oxid 
0.129 
0.174 
Calcic ' xid_ 
8.117 
10.917 
Magnesic Oxid 
. 13.244 
17 813 
Ferric and Alu. Oxids 0 020 
0.027 
Manganic Oxid_ 
0.040 
0.054 
Ignition _ 
9.938 
13.367 
Sum _ _ . 
.100.346 134.966 
Oxygen equiv. to 
Chlorin __ 
0.221 
0.297 
Total_ . __ 
.100.125 
134.669 
Grs. 
Combined. 
Per 
Imp. 
Cent. 
Gal. 
Calcic Sulfate_ . 
19.704 
26.502 
Magnesic Sulfate.__ 
39.741 
53.452 
Potassic Sulfate_ 
0.237 
0.319 
Sodic Sulfate.. ... 
17.574 
23.637 
Sodic Chlorid _ 
1.620 
2.179 
Sodic Hydric Car- 
bonate _ 
0.463 
0.623 
Sodic Carbonate.. 
10.590 
14.243 
Ferric and Alu. Oxids 0.020 
0.027 
Manganic Oxid . ... 
0.040 
0.054 
Ignition__ ___ 
9.938 
13.367 
Sum_ .. _ 
99.927 134.353 
Excess Silicic Acid 
0.125 
0.168 
Total... _ 
100.052 134.521 
Total solids, 1H4.5 grains per imperial gallon. 
SANITARY ANALYSIS. 
Parts Per Million. 
Total Solids_1,921.4000 
Chlorin _ 24.3000 
Nitrogen as Nitrates_ 0.2000 
Nitrogen as Nitrites_ 2.4000 
Parts Per Million. 
Saline Ammonia_ 0.0944 
Albuminoidal Ammonia_0.6171 
Oxygen required.. 5.9000 
