26 BULLETIN 726, U. S. DEPARTMENT OF AGRICULTURE. 
Table XIV. — Cleaning data for three Colorado districts (work done by hand). 
District. 
Year. 
Number 
of farms. 
Acres 
cleaned 
per farm. 
Number 
times 
cleaned. 
Number 
of men. 
Hours 
per acre. 
Cost per 
acre. 
Rocky Ford. 
Fort Morgan 
Greeley 
1914-15 
1915 
1914-15 
22. 75 
37.97 
25.6 
1.21 
1.09 
1.06 
2.37 
.91 
1.12 
SO. 43 
.17 
.23 
Table XV. — Cleaning data for three Colorado districts {work done by man and horse 
labor). 
District. 
Year. 
Num- 
ber of 
farms. 
Acres 
cleaned 
per farm. 
Num- 
ber 
times 
cleaned. 
Crew. 
Hours per acre. 
Total 
Man. 
Horse. 
Man. 
Horse. 
acre. 
Rocky Ford 
1914-15 
1915 
1914-15 
55 
56 
53 
25.2 
37.53 
28.9 
1.44 
1.44 
1.04 
1.6 
1.62 
1.34 
2.49 
3.12 
3.24 
1.73 
.94 
.3 
2.90 
2.07 
.63 
S3. 60 
.41 
Greeley 
.13 
Fig. 9. — Removing silt from an irrigation ditch. In order to insure rapid delivery of water when the 
crop requires it, some work must be devoted to cleaning ditches a few weeks prior to the first run in 
the canal. 
On farms where trie canal and distributing laterals are accessible 
to horses, silt and other debris that have been deposited can be 
loosened with a plow and the accumulated material can be removed 
with a home-made V ditcher (fig. 10). By using horses much more 
work usually can be done within a limited period than by hand, 
though it does not necessarily follow that the work can be accom- 
plished at a lower cost. Where equal amounts of work are-involved, 
the combined crew will undoubtedly have the advantage. The 
three districts were represented by approximately equal numbers of 
men who did cleaning with a combined crew. Cleaning was done 
practically 1J times at Rocky Ford and Fort Morgan. Greeley 
