UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 190 **=«i 
Contribution from the Office of Experiment Stations 
A. C. TRUE, Director 
Washington, D. C. 
April 24, 1915 
THE DRAINAGE OF IRRIGATED LAND 
By 
R. A. HART, Supervising Drainage Engineer 
CONTENTS 
Introduction 
Manifestations of Poor Drainage Condi 
tions 
Specific Objects of Draining .... 
Preliminary Investigations 
Open Canals 
Covered Drains 
Choice of Type of Drain 
Location of Open Canals 
Depth and Location of Covered Drains 
Protective Devices for Open Canals . 
Page 
1 
2 
2 
2 
4 
5 
Page 
Protective Devices for Covered Drains . 15 
Some Typical Problems and Their Treat- 
ment 18 
Construction of Drains 24 
Maintenance 28 
Subsequent Treatment of Land .... 29 
What Drainage Accomplishes . . . , 31 
Cost of Draining 32 
Cooperative Drainage 33 
Conclusion 34 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1915 
