THE FLOW OF WATER IN CONCRETE PIPE. 



21 



M refers to F. F. Moore, designing engineer, board of water supply, 

 New York City. 



S refers to the writer, Fred. C. Scobey, senior irrigation engineer, 

 in charge of experiments on the flow of water in channels and pipes. 

 In these experiments and computations he was assisted by E. C. 

 Fortier, P. A. Ewing, and Thomas H. McCarthy. 



The other columns are considered self-explanatory. 



EXPLANATORY NOTES ON TABLE 4. 



Column 1 gives the same consecutive numbers as column 1, Table 3. 

 See discussions after "Column 1 " on page 20. 



Column 10 gives the equation for the pipe, as developed by the 

 tests. This equation is obtained by the "center of gravity" method — 

 the equivalent of the "least squares" method in its simplest form. 



The other columns are considered self-explanatory. 



Table 3. — Elements of experiments for the determination of friction losses in concrete 

 pipes, running full; with retardation coefficients for various formulas. 



1 



2 



© 



3 



4 



5 



6 



Pi 



7 



8 



© 



Coefficients of retardation. 





'9 



10 



11 



12 



13 



14 



& 



"3 <j 



© 3 





CD 





•d 



o a 



■g'S 



















3 



o 

 ft 



.§£ 



C3 



Jj 



Name and description of 



E?§ 





o<2 













a 





> 



B 



o 



CD 



a 

 i— i 



pipe. 



■g w 



5 





o 



to 

 ,Q 

 o 

 a 

 m 



>> 



CD 



o 



o 



a 

 © 



a 



M 



'© 









d 





Q 



V 



H 



c s 



c 



Cxi, 



Cm 



n 



/ 









ins. 





cu.ft. 



feet. 



feet. 















1 



S 19 



i 



8.0 



Pomona, Calif . ; jointed ce- 



1.22 



3.51 



10.800 



0.291 



82.6 



94.8 



0.95 



0. 0124 



.0378 





1915 



2 





ment pipe on continuous 



1.24 



3.56 



10.780 



.295 



83.8 



96.3 



.98 



.0123 



.0357 







3 





down grade, straight; 

 laid about 1885. 



1.24 



3.56 



10. 820 



.295 



83.8 



96.1 



.98 



.0123 



.0359 



2 



S21 



2 



10.0 



Pomona, Calif . ; jointed ce- 



1.10 



2.02 



3.120 



.271 



79.2 



92.9 



.96 



.0134 



.0410 





1915 



1 





ment pipe on continuous 



1.12 



2.06 



3.129 



.276 



80.8 



94.6 



.98 



.0132 



. 0396 







3 





down grade, straight ; laid 



1.13 



2.08 



3.334 



.270 



79.1 



92.3 



.95 



.0134 



.0414 







4 





1888. 



1.14 



2.10 



3.403 



.270 



79.0 



92.3 



.95 



.0134 



.0414 



3 



S28 



1 



10.0 



Ontario, Calif.; jointed ce- 



2.59 



4.75 



15. 900 



.283 



82.6 



90.7 



.91 



.0130.0378 





1915 



2 





ment pipe, on continuous 



2.65 



4.87 



15. 850 



.290 



84.8 



93.1 



.94 



. 0126 L 0358 











grade. 





















4 



S20 



1 



12.0 



Pomona, Calif.; jointed ce- 



1.25 



1.60 



1.793 



.253 



76.2 



88.4 



.91 



.0144 



.0451 





1915 



2 



ment pips, on continuous 

 grade. 



1.25 



1.61 



1.884 



.248 



73.2 



86.6 



.89 



.0147 



.0468 



5 



S26 



10 12.0 



Pomona, Calif . ; jointed ce- 



1.13 



1.50 



1.694 



.244 



72.8 



85.4 



.88 



.0148.0485 





1915 



9 



ment pipe, straight and 



1.32 



1.68 



2.120 



.244 



73.0 



84.8 



.87 



.01481.0484 







1 



approximately level, 



1.54 



1.95 



2.188 



.280 



83.8 



97.3 



1.00 



.0133 



.0367 







2 



Clearwater; laid 1885. 



1.57 



2.00 



2.497 



.268 



80.0 



92.4 



.94 



.0138 



.0402 







3 





1.70 



2.17 



2.925 



.268 



80.4 



92.0 



.94 



.0137 



.0401 







4 





1.80 



2.29 



3.342 



.265 



79.2 



90.4 



.92 



.0139 



.0411 







5 







2.10 



2.68 



4.423 



.270 



80.7 



90.9 



.92 



.0137 



.0396 







6 







2.24 



2.85 



4.918 



.272 



81.4 



91.3 



.92 



.0136 



.0390 







8 







2.71 



3.45 



7. 055 



.275 



82.1 



91.0 



.92 



.0133 



.0382 







7 







2.85 



3.63 



7.649 



.278 



82.9 



91.6 



.92 



.0135 



.0374 



G 



S33 



1 12.0 



Ontario, Calif.; jointed ce- 



4.59 



5.85 



14. 820 



.322 



95.9 



103.3 



1.03 



.0120 



.0279 





1915 







ment pipe, straight ; laid 

 1911. 





















7 



S27 



2 



12.0 



Ontario, Calif.; jointed ce- 



1.51 



1.92 



1.405 



.343 



102.1 



121.1 



1.25 



.0114 



.0246 





1915 



1 ■ 



ment pipe, straight and 

 level; laid 1900. 



1.57 



2.00 



1.489 



.347 



103.6 



122.2 



1.26 



.0112 



.0240 



8 



S53 



1 11.8 



Oakdale , Calif. ; j ointed ce- 



.98 



1.29 



1.310 



.240 



71.8 



85.2 



.88 



.0148 



.050 





1916 



B 



ment pipe, slight sag in 



1.18 



1.55 



1.769 



.249 



74.4 



87.3 



.90 



.0145 



.0465 











profile. 





















