THE PLOW OF WATER IK 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 
ft 
£ 
8 
ft 
Coefficients of retardation. 
9 
10 
11 
12 
13 
11 
O 
1 
a 
o 
"3 ,: 
.5 >» 
| 
c3 
1 
Name and description of 
T3 
&§ 
o-d 
© 
©^ 
> 
t-c 
O 
CO 
o 
1 
CO 
a 
pipe. 
-gco 
CO 
ft ' 
la 
■58 
CO ,_^ 
o 
© 
o 
© 
>> 
© 
o 
1 
I 
1 
d 
Q 
V 
H 
C s 
c 
Cxs 
Cm 
n 
/ 
ins. 
CU.ft. 
feet. 
feet. 
- 
i 
S19 
1 
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 
grade. 
2.65 
4.87 
15. 850 
.290 
84.8 
93.1 
.94 
.0126 
.0358 
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 pipe, on continuous 
grade. 
1.25 
1.61 
1.884 
.248 
73.2 
86.6 
.89 
.0147 
.0468 
5 
S 26 
10 
12.0 
Pomona, Calif. ; jointed ce- 
1.18 
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 
.0148 
.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 
.343102.1 
121.1 
1.25 
.0114 
.0246 
1915 
1 
ment pipe, straight and 
1.57 
2.00 
1.489 
.347103.6 
122.2 
1.26 
.0112 
.0240 
level; laid 1900 
8 
S53 
1 
11.8 
Oakdale , Calif. ; j ointed ce- 
.98 
1.29 
1.310 
.240 
71.8 
85.2 
.88 
.0148 
.050 
1916 
6 
ment pipe, slight sag in 
profile. 
1.18 
1.55 
1.769 
.249 
74.4 
87.3 
.90 
.0145 
.0465 
