IRMGATION I'm NORTiBERKr COLOEADO. 



16 



Poudre Eeservoir 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 j^eriod 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. 







a 



■a 



1 



"o 



c3 



1 



to 



3 



s 





1 



"3 



Absorption losses. 













Period. 







03 



ft 

 n3 



^1 



a . 



O 



03 





3- 





1 



go ^ 



ft 03 



a 



3 





1 

 P 



o 



o 

 S 



2 

 < 



< 





c4 



i 



o 



03 



O 

 IB 



o 



03 



3 M m 



+3 u 

 g ft 



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, 































May8-26 



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 



6.0 



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 



.2 



832.7 



811.9 



20.8 



2.07 



.027 



.252 



