DRAINAGE OF IRRIGATED SHALE LAND. 3 5% 
though poorly constructed waste ditches and a small reservoir to the 
north have contributed. 
Lateral A, as indicated in figure 9, was installed with the view of 
intercepting the seepage from the west, while the main tile drain 
Proposed T1/2 DFQI1 acme ame cme Shale Sur hace —526— 
Ground Surfacé_—.—538——-_ Water Surface .—--534--~ 
SCALE OF FEET 
Ghat SOE a Ol Dn a0 OO 
Fig. 7.—Five-acre tract near Canon City, Colo., showing plan of drainage. 
was constructed next to take care of the waste water from the north 
and was indispensable for this purpose. However, so far as any 
actual benefits from drainage are concerned, the results from both 
of these drains were negligible and offer the most convincing ev1- 
dence presented by any of the examples in this bulletin of the failure 
