UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 852 



Contribution from the Bureau of Public Roads - 

 Thos. H". MacDonald, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



October 28, 1920 



THE FLOW OF WATER IN 

 CONCRETE PIPE 



By 

 FRED. C. SCOBEY, Senior Irrigation Engineer 



With Discussion by KENNETH ALLEN, ARTHUR S. BENT, F. C. FINKLE, 

 ALLEN HAZEN, J. B. LIPPINCOTT, and H. D. NEWELL 



CONTENTS 



Introduction 1 



Nomenclature 2 



Types of Pipe 3 



PART 1. FLOW OF WATER IN PRES- 

 SURE PIPES: 5 



Formulas for Flow of Water in Con- 

 crete Pressure Pipes 5 



Opinions of Engineers Regarding the 



Carrying Capacity of Concrete Pipe 9 

 Necessary Field Data for Determin- 

 ing the Retardation Elements of 



Various Formulas 12 



Scope of the Experiments .... 13 

 Equipment and Methods Employed 

 for Collecting and Interpreting 



Field Data 13 



Elements of Experiments for the De- 

 termination of the Friction Losses 

 in Concrete Pipes 20 



PART 1. FLOW OF WATER LN PRES- 

 SURE PIPES— Continued 



Descriptions of Pipes 25 



Analysis of Experimental Data . . 45 

 Effect of Age Upon Carrying Capacity 49 

 Capacity of Concrete Pipes .... 51 

 Estimate Diagrams and Tables; So- 

 lution of Typical Pipe Problems . 54 

 Comparison cf Various Formulas . 62 

 Capacity of Concrete Pipe Compared 

 with that of Wood-Stave. Cast-Iron 66 



or Riveted-Steel Pipe 65 



PART 2. FLOW OF WATER IN GRADE 



LINE PIPES: 66 



Descriptions of Pipes 71 



Conclusions 74 



Acknowledgments 66 



Appendix 77 



Discussion 92 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 

 1920 ' 



