IRRIGATION IN NORTHERN COLORADO. 
55 
variation in this particular. The general practice is to run water in 
each furrow, but some farmers use every other furrow and altenate 
for each irrigation the set used. Permanent head ditches are often 
fitted with concrete or wooden checks to hold the water up to the 
notches cut in the bank; otherwise canvas or metal dams are used. 
Where head ditches are necessary in the middle of a field they are 
APRIL 
10 20 
MAY 
10 20 
JUNE 
10 20 
JULY 
10 20 
AUGUST SEPTEMBER 
10 20 10 20 
.8 l916 -I- 
ir J 
=3- ± 1 
J 1 
11 1 1 
11 lull 
r t Jlmlir 
JJt] ill re 
* HlnllHL 
1 —Li ■ 
o 
o 
.4 1917 
I il 
; - ; "' _,JjJ-;5± 
e IllLlllll . 
:zzzz±z=dEllUfe 
Fig. 7. — Irrigation of sugar beets. Water requirements of 584 acres in 1916 
and 376 acres in 1917. 
plowed out in the usual manner and dragged with a " V " to smooth 
and pack the sides. For turning the water from the head ditch to the 
furrows a notch may be made for each furrow or the water from a 
single cut may supply several furrows. 
Under small canals with good water rights, when the farmer 
finishes his day of irrigating he goes to the head of his supply ditch 
and cuts off the water there for the night. But under large canals 
