A NEW METHOD OF ESTIMATING STREAM-FLOW 217 
Table 63 — Values of constants, etc., in equation (96) for various streams 
Name of 
river 
2/0 
7 
o 
7<J 
Curve 
begins 
Skew- 
ness 
Number 
of obser- 
vations 
used 
Criterion 
K 
A 
619.84 
332.82 
120.63 
139.01 
0.544346 
.425155 
. 196588 
.189615 
-1.426997 
- 1 . 990404 
-3.606625 
-3.412353 
-0.776781 
— 0.846230 
-0.709019 
-0.647034 
(c.f.s.) 
0.078 
0.075 
818 
1820 
2.12 
2.17 
1.85 
1.68 
1 , 759 
1,707 
731 
731 
-16.4 
-48.9 
- 5.84 
- 8.4K 
B 
Cumberland 
Delaware 
In the first three columns of Table 64 are shown the mean, median and mode as 
estimated from the fitting curve of the frequency distribution of discharges on each 
stream. The mode was negative in every case. Using equation (97), in connection 
with the values of S e shown in Table 51, page 195, the values of Ki, K 2 and K, 
shown in columns 5, 6, and 7, Table 64, were computed for Streams A and B. The 
Table 64 — Mean, median and mode, etc., of frequency distributions 
River 
Mean from 
fitting curve 
Median by 
inspection 
Mode from 
fitting curve 
Ki 
Ki 
K, 
A 
(c.f.s.) 
0.154 
0.135 
3780 
5540 
(c.f.s.) 
0.096 
0.089 
1890 
3580 
(c.f.s.) 
-0.186 
-0.258 
— 6390 
- 5010 
0.70 
0.71 
1.12 
1.08 
-0.58 
-0.37 
B 
Cumberland 
Delaware 
mean of the two values in each case was taken as the best value of these constants 
obtainable from this investigation. These means are 
(100) 
Kx =+0.70 
1T 2 =+1.10 
if, = -0.48 
from which the S c of the Cumberland and Delaware Rivers are estimated to be, 
respectively, using the mean, median and mode in Table 64, 2,600 and 3,410 cubic 
feet per second. Using the mean K's of equation (100), the estimated S c of Streams 
A and B are, respectively, 101 and 105, in error by —7 per cent and 9 per cent, 
respectively. 
The variation of the three separate values of S c obtained for each stream from 
the mean of the three values for each stream is given in Table 65. 
Table 65 — Variations of S c from mean value 
River 
Mean discharge 
Median discharge 
Mode discharge 
A 
p. ct. 
7 above 
10 below 
2 above 
14 above 
p. ct. 
5 above 
7 below 
20 below 
16 above 
p. ct. 
12 below 
18 above 
18 above 
30 below 
B 
Cumberland 
Delaware 
