UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 194 
Contribution from the Office of Experiment Stations 
A. C. TRUE, Director 
X 
Washington, D. C. 
PROFESSIONAL PAPER 
* May 10, 1915 
THE 
FLOW OF WATER IN IRRIGATION 
CHANNELS 
By 
FRED. C. SCOBEY, Irrigation Engineer 
CONTENTS 
Introduction 1 
Nomenclature • . . . 2 
Historical 2 
Necessary Field Data for Values of n . . 4 
Scope of Experiments 7 
Equipment and Methods Employed for 
Collecting Field Data 7 
Correction for Velocity Heads .... 15 
Elements of Field Tests to Determine Re- 
tardation Factors in Eutter and Chezy 
Formulas 16 
Page 
Description of Channels 28 
The Use of Values of n 45 
Recommendations for Values of n for 
Different Kinds of Channels .... 47 
Estimation Charts 52 
Variation of n in the Same Channels . . 58 
Conclusions 60 
Acknowledgments 61 
Appendix 62 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1915 
