IRRIGATION IN NORTHERN COLORADO. 
75 
Poudre Reservoir No. 15, Woods Lake, Kluver Lake, Curtis Lake, 
Claymore Lake, Water Supply and Storage Co. Reservoir No. 4, 
and Dealy Reservoir. These reservoirs afforded a range in surface 
area up to 1,000 acres, in depth up to 40 feet, and in volume up to 
17,500 acre-feet. Records were kept of the operation of all the more 
important reservoirs of the valley, but many of these records were 
not suitable for computing absorption losses and were discarded. 
No capacity tables were available for a number, and time could be 
found to survey only a few of these. Other records covering periods 
of inflow and outflow were discarded on account of the poor condi- 
tions at the measuring stations on the inlet and outlet canals. Thus 
in the case of Terry Lake the rating stations on both inlet and outlet 
were subject to backwater conditions and for that reason the only 
records of Terry Lake used in computing losses were those made 
during periods of no inflow nor outflow. 
Table 31 is given to show the method used in computing the 
loss, and practically explains itself. In estimating the increase in 
the reservoir by rainfall it was necessary to use the rainfall records 
at Fort Collins, which is as much as 15 miles from some of the 
reservoirs, together with the area at the high water line and the 
probable run-off from the drainage area above. For this reason 
some of the periods overlap, the shorter excluding rains which show 
in the longer period and serving as a check. 
The average absorption loss is shown by curves in figures 14, 15, 
and 16, in which the loss in acre-feet per day is plotted against the 
depth, area, and volume. The curves are based on more than 200 
points, each of which represents the loss in a single reservoir for a 
period of from 3 to 30 days during the spring and summer months. 
Table 31. — Absorption losses from Claymore Lake. 
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1916. 
June 1-28 
27.31 
14.54 
13.77 
14.16 
79.0 
893.3 923.6 
4.2 
927.8 
862.9 
64.9 
2.38 
0.030 
0.266 
June 14-28 
13.98 
14.21 
13.77 
13.99 
78.6 
880.3 897.6 

897.6 
862.9 
34.7 
2.48 
.032 
.282 
1917. 
May 8-26 
18.00 
14.78 
14.65 
14.70 
80.3 
936.2 
939.8 
18.5 
958.3 
932.6 
25.7 
1.43 
.018 
.153 
May 12-19 
7.00 
14.66 
14.53 
14.60 
80.0 
928.1 
933.4 
933.4 
922.8 
10.6 
1.51 
.019 
.163 
June 2-30 
28.00 
14.70 
14.08 
14.39 
79.6 
912.0 
936.6 
936.6 
887.3 
49.3 
1.76 
.022 
.193 
July 4-28 
24.00 
13.99 
13.50 
13.75 
78.1 
861.0 
880.3 
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886.3 
841.7 
44.6 
1.86 
.024 
.216 
July 11-21 
9.85 
13.91 
13.64 
13.78 
78.1 
863.4 
874.0 
874.0 
852.7 
21.3 
2.16 
.028 
.250 
Aug. 1-11 
10.04 
13.38 
13.11 
13.24 
76.9 
822.2 
832.5 
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832.7 
811.9 
20.8 
2.07 
.027 
.252 
