8 
Colorado Experiment Station 
COST OF SYSTEM 
Th3 cost data for installation of this sysdnn are as follows: 
300 feet 6-inch tile at 6c per foot_ $ 18.00 
7,382 feet 2^-inch tile at 4c per foot_ 295.28 
7,682 feet of trenching, laying tile and back-filling 
at 2.8c per foot_ 215.10 
Hauling and distributing tile_ 3.48 
Galvanized iron headgates_ 8.00 
Construction of concrete boxes_ 18.65 
Surveying _ i7-50 
Total _ $576.01 
The amount of land irrigated by this system is 2.64 acres, making 
the cost per acre for installing a subirrigation system of this kind 
$218.18. 
SOIL 
The soil on the piece of ground covered by the subirrigation sys¬ 
tem is fairly uniform and is a deep silt loam. Just how deep this sur¬ 
face soil is cannot be stated, but investigations were made to a depth of 
12 feet with a soil auger and they showed the same uniform silt-loam 
soil all the way down. It is a soil that could be called retentive, as far 
as moisture conditions are concerned, but it is a soil that would take 
water rather slowly and one would expect lateral percolation of the 
water to be fairly good. 
SPREAD OF THE WATER FROM THE PIPES 
Investigations were carried on from time to time to ascertain the 
spread of water from the pipe line. These investigations were made 
with a soil auger. Borings were made in lines at right angle to a 
tile line. The holes were spaced 6 inches apart. During the first part 
of the experiment soil samples were taken and the moisture content 
determined. In the latter part of the work this system was abandoned, 
and the lateral percolation of the water was determined by means of the 
soil auger alone. The results obtained in this part of the work were 
not very satisfactory. The data show a great variation in the lateral 
percolation of water from diflerent lines, and also a large variation 
in this percolation of water on the same line at different places. Approx¬ 
imately an average condition is shown in Fig. 4. 
