98 
A NEW METHOD OF ESTIMATING STREAM-FLOW 
OTHER EVIDENCE IN FAVOR OF THE ADOPTED FORM OF THE EVAPORATION FORMULA 
The character of the evaporation curve derived from Solution BB } is a strong 
indication that the wind term, e f r^r — 2.4 j \E„ does not belong in the evapora- 
tion formula. The results of Solution BB t were also analyzed in a more orthodox 
way than the one already presented. An illustration of this simple test is given 
on page 19 of Running's Empirical Formulas. The general problem is there 
stated as follows : 
"If two variables, x and y, are so related that when values of x are taken in an arith- 
metical series the nth differences of the corresponding values of y are constant, the law con- 
necting the variables is expressed by the equation 
y = a-\-bx+cx z 
qx n 
(24) 
Table 34 — Study of form of observation equation of 
Solution BBi 
Vioo / 
Sum of 
e's 
Sum of 
J'a 
Number 
Mean 
e 
Mean 
Mean / 
Mean e 
First 
differences 
Second 
differences 
-1.4 
-1.3 
-1.2 
-1.1 
-1.0 
- .9 
- .8 
- .7 
- .6 
- .5 
- .4 
- .3 
- .2 
- .1 
.0 
+ -1 
+ -2 
+ -3 
+ -4 
+ -5 
+ -6 
+ .7 
+ .8 
+ .9 
+ 1.0 
+ 1.1 
+ 1.2 
+ 1.3 
+ 1.4 
+ 1.5 
+ 1.6 
+ 1.7 
+ 1.8 
+ 1.9 
+2.0 
+2.1 
+2.2 
+2.3 
+2.4 
+2.5 
+2.6 
+ 2.7 
4 
23 
90 
33 
415 
131 
629 
326 
• 919 
443 
1271 
430 
1363 
378 
10S5 
254 
592 
231 
452 
203 
296 
36 
134 
90 
71 
6 
127 
54 
65 
+ 3 
+ 14 
+ 49 
- 25 
+ 30 
-124 
+ 9 
+ 92 
+354 
+ 132 
+724 
- 71 
+ 87 
+ 97 
-195 
+ 30 
-762 
- 16 
-127 
+ 65 
-234 
-114 
- 77 
-221 
-117 
- 75 
-114 
- 75 
+ 8 
1 
2 
10 
3 
28 
12 
60 
23 
71 
31 
87 
31 
100 
27 
68 
20 
52 
16 
31 
10 
27 
3 
13 
8 
5 
1 
13 
5 
6 
4 
12 
9 
11 
15 
11 
13 
14 
13 
14 
15 
14 
14 
14 
16 
13 
11 
14 
15 
20 
11 
12 
10 
11 
14 
6 
10 
11 
11 
+ 3 
+ 7 
+ 5 
- 8 
+ 1 
-10 

+ 4 
+ 5 
+ 4 
+ 8 
- 2 
+ 1 
+ 4 
- 3 
+ 2 
-15 
- 1 
- 4 
+ 6 
- 9 
-38 
- 6 
-28 
-23 
-75 
- 9 
-15 
+ 1 
+ 0.75 
+ .58 
+ .56 
- .73 
+ .07 
- .91 
.00 
+ .29 
+ .38 
+ .29 
+ .53 
- .14 
+ .07 
+ .29 
- .19 
+ .15 
- 1.36 
- .07 
- .27 
+ .30 
- .82 
- 3.17 
- .60 
- 2.55 
- 1.64 
-12.50 
- .90 
- 1.36 
+ .09 
- 0.17 
- .02 
- 1.29 
+ .80 
- .98 
+ .91 
+ .29 
+ .09 
- .09 
+ .24 
- .67 
+ -21 
+ .22 
- .48 
+ .34 
- 1.51 
+ 1.29 
- .20 
+ .57 
- 1.12 
- 2.35 
+ 2.57 
- 1.95 
+ .91 
-10.86 
+ 11.60 
- .46 
+ 1.45 
+ 0.15 
- 1.27 
+ 2.09 
- 1.78 
+ 1.89 
- .62 
- .20 
- .18 
+ .33 
- .91 
+ .88 
+ .01 
- .70 
+ .82 
- 1.85 
+ 2.80 
- 1.49 
+ -77 
- 1.69 
- 1.23 
+ 4.92 
- 4.52 
+ 2.S6 
-11.77 
+22.46 
-12.06 
+ 1.91 
22 
- 56 
2 
11 
-28 
- 2.55 
5 
8 
+ 36 
- 31 
1 
1 
5 
8 
+36 
-31 
+ 7.20 
- 3.88 
-11. OS 
9 
+ 21 
1 
9 
+21 
+ 2.33 
759 
