UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 190 



Contribotion from the Office of Experiment Stations 

 A. C. TRUE, Director 



Washington, D. C. 



THE DRAINAGE OF IRRIGATED LAND 



By 

 R. A. HART, Superyising Drainage Engineer 



CONTENTS 



Page I 



lotrodoction 1 



Manifestations of Poor Drainage Condi- 

 tions 2 



Specific Objects of Draining 2 



Preliminary Investigations 2 



Open Canais 4 



Covered Drains 5 



Choice of Type of Drain 8 



Location of Open Canals 10 



Depth and Location of Covered Drains . 10 



Protective Devices for Open Canals . . 13 



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 PUINTING OFFICE 



1915 



RBBMBH 



