DRAINAGE OF IRRIGATED SHALE LAND. 



33 



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 Ti/e Dra/'n^^ _ -_ Sha/e Surface > "S, 2 6 — ■ 



Ground Surface ' 538 . WaterSurface^^-- — 534 — 



scale: of feet 



100 so 100 200 



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 draina^ge are concerned, the results from both 

 of these drains were negligible and offer the most convincing evi- 

 dence presented by any of the examples in this bulletin of the failure 



