42 
SEEPAGE OR RETURN WATERS FROM IRRIGATION. 
therefore noted as a disturbing condition. Likewise, some of the 
•seepage which should enter the next section between the Pump 
house and the Ogilvy ditch, enters the river lower down. 
TABLE VII. 
OQ 
O) 
Water Applied. 
Arerage Inflow from Seepage. 
d 
CD 
O 
a 
cC 
OQ 
•M 
«1H 
O 
0) 
O) 
I 
(D 
o O 
H- 
O) 
Cu, 
■Canon to L. & W. canal. 
L. & W. to No. 2 canal. 
No. 2 to Eaton canal. 
Eaton to No. 3. 
No. 3 to Pump house, Greeley 
No. 2 to Pump house, Greeley 
Pump ho’&se to Ogilvy ditch.. 
No. 2 to Ogilvy ditch. 
Ogilvy to mouth of Poudre_ 
Beyond mouth of Poudre. 
7.25 
10.10 
3.0 
9.0 
3.0 
15.0 
2.5 
17.5 
4.0 
18,400 
51,800 
37,000 
30,300 
46,700 
114,000 
23,100 
137,100 
■ 42,700 
38,000 
7 
21 
15 
12 
18 
45 
9 
55 
17 
1 
1 
No. Years Ob¬ 
servation . 
1 
Observed. 
Computed. 
j 
Observed gain 
per Mile. 
9 
15 
8 
2 
9 
21 
21.6 
2 
’7 
28'6 
48" 
' 2 " 
8 
19.2 
10 
8 
9 
45.2 
57 
2.5 
8 
23.8 
18 
6 
• • 
.... 
.... 
.... 
THE EFFECT OF TEMPERATURE ON THE INFLOW. 
§ 31. The effect which temperature might have upon the 
-amount of inflow was not considered of any importance until the 
unexplained differences caused a consideration to be given to its 
possible effect. It is known that low temperatures increase the 
viscosity of water. The effect is especially noticeable in the flow 
through small tubes, so much so that five times as much water 
will pass through a capillary tube at 200° as at 32° F. The effect 
has been noticed on the amount collected by drains, and in varying 
the discharge in cases like those of the gathering pipes of the 
Denver Water Co., in the bed of Cherry creek. A comparison 
between the soil temperatures at the Colorado Agricultural College 
■and the inflow into these gathering galleries has been made in bul¬ 
letin 38 of the Utah Experiment Station. As our measurements of 
the seepage were nearly all taken in the same month, it was not 
thought that the difference of temperature would be sufficient to 
affect the quantity of flow. But it may have a much greater effect 
than was at first thought probable. The water-carrying stratum 
lies at different depths, and is of different thicknesses. Its temper¬ 
ature therefore varies. Besides, the descending water carries down 
the temperature of the surface to some extent. Still, the indications 
of the soil thermometers may be taken to show the variations in the 
temperature of the seepage water at the time of gaging, and hence 
give the means of estimating the effect of temperature. 
The readings of the soil thermometers will not be far from the 
temperatures of the soil at the corresponding depths throughout the 
Cache a la Poudre an<i the Platte valleys. There are three sets of 
