, / 9 
30 
For the valley there is given the average duty. When seepage 
is considered it may be noted that the duties for the whole valley 
are nearly the same as those of the Larimer & Weld Canal. 
Depths in Feet. 
May 1 to Sept 1 
123 days. 
Apr. 1 to Sept. 1 
153 days. 
Apr. 1 to Nov. 1 
184 days. 
June 
30 days. 
Depth from Ir¬ 
rigation . 
Irrigation and 
Bain. 
1 
Depth from Ir¬ 
rigation . 
] 
Irrigation"" and 
Rain. 
Depth from Ir- 
rigatian. 
I 
Irrigation 'and I 
Bain. j 
! 
Depth from Ir¬ 
rigation. 
Irrigation and 
Rain. 
No. 2 Canal. 
2.09 
2.86 
(2.09) 
3.03 
(2.09) 
2.96 
.925 
1.12 
Larimer & Weld Canal. 
1.49 
2.26 
1.49 
2.43 
1.49 
2.36 
.73 
.93 
Valley. 
1.25 
2.02 
1.30 
2.24 
1.33 
2.22 
.64 
.84 
ValJey, seepage included.... 
1.41 
2.18 
1.50 
2.44 
1.57 
2.46 
.68 
.88 
CORBESPONDING DUTY PER SECOND-FOOT, IN ACRES. 
No. 2 Canal. 
112 
81 
146 
101 
. 176 
124 
65 
531/2 
Larimer & W»ld Canal. 
165 
109 
205 
126 
246 
155 
81 
64 
Valley. 
195 
122 
233 
136 
274 
168 
94 
71>i 
Valley, seepage included.... 
174 
113 
204 
125 
244 
151 
88 
68 
The bulletin, intended only as a step towards determining the 
present practice in Colorado, holds true of other valleys so far as the 
conditions of the Cache-a-la-Poudre valley are typical. 
The duty, as estimated in acres per cubic foot of water per sec¬ 
ond, may vary betv/een wide limits, according to the method of 
estimation, and on the same farm and the same depth of w^ater applied. 
Unless these conditions are taken into account, it is better to estimate 
the depth of water needed and the time through which it is neces¬ 
sary. There is less difference between different canals and different 
users than is generally considered true. 
The amount of water given at oi;e irrigation depends more , 
upon the preparation of the ground or its conditions than upon the 
crop. Under Colorado conditions, irrigations of less than six inches 
in depth are rarely given. 
The difference between the nominal rates of duty in Colorado 
and those in other countries, has been partly because those of Colo¬ 
rado are based upon the use in June, the month of greatest need, 
while those of others take the whole season or year through. When 
reduced to the same basis, the practice in Colorado agrees favorably 
with that of other countries. It would seem as probable from the 
measures that the average duty of one cubic foot per second flowing 
constantly, as measured at the head of the canal, is 60 to 65 acres in 
June, to 175 to 300 for the whole season. The last represents the 
conditions when a reservoir is available in which water may be stored. 
