STREAM POLLUTION 
397 
Table 4. — Characteristics of water at different depths in river lakes produced by impounding flowing 
rivers 
I. LAKE WILSON 1 
Depth in feet 
Water tem- 
perature, de- 
grees centi- 
grade 
pH 
Specific con- 
ductivity in 
rahox 10* at 
25° C. 
Fixed carbon 
dioxide, cubic 
centimeters 
per liter 
Dissolved 
oxygen 
parts per 
million 
Light pene- 
tration, mil- 
lionth inten- 
sity depth in 
millimeters 
8 1 
30.2 
7.4 
177 
13.4 
7.5 
2, 053 
10 
30.2 
7.6 
178 
12.9 
7.3 
2, 053 
20 - - 
29.5 
7.4 
181 
13.2 
6. 1 
1,297 
30 - - 
29.0 
7.5 
178 
12.9 
5.8 
1,075 
40 
28.6 
7.5 
175 
12.9 
5.7 
1, 075 
50 ....... 
28.2 
7.5 
173 
12.9 
5. 1 
972 
60 . _ _ . ....... 
27.8 
7.3 
161 
12.9 
3.6 
1,075 
70 . 
22.9 
7.2 
167 
15.4 
.2 
9, 036 
80 .... .... 
21.9 
7. 2 
158 
15.0 
.2 
9,036 
90 .. 
21.5 
7. 1 
159 
15.0 
.2 
6,910 
100 . . . .... 
20.9 
7.2 
159 
15.4 
. 1 
6,262 
110 . 
20.8 
7.2 
162 
15.9 
.2 
5, 335 
II. ELEPHANT BUTTE RESERVOIR 1 
S* 
3 
6 
33.0 
33.0 
23.8 
8. 1 
8. 1 
8. 1 
1.009 
1,062 
1,024 
29.5 
28.7 
28.7 
7. 1 
7.2 
5.9 
6, 823 
6,823 
14,344 
10 
23.0 
8.1 
1,017 
28. 1 
5.5 
13,414 
20 
22.8 
7.6 
1,022 
28.4 
6. 1 
28, 874 
30 . _ 
21.5 
7.6 
1,081 
29.3 
5.9 
30,254 
40 
19.8 
7.6 
1, 107 
29. 1 
6.2 
63. 987 
50 - 
19. 6 
7.6 
1,068 
29.2 
6.5 
63, 987 
60 
18.8 
7.6 
1,070 
29.0 
6.6 
63, 987 
70 _____ 
18.0 
7.6 
996 
29.6 
6.8 
61, 237 
80 _ _ 
17.8 
7.6 
1,067 
29.8 
5. 1 
61,237 
90 
17.6 
7.6 
1,045 
30.2 
5. 1 
63, 987 
100 _ _ _ 
17. 1 
7. 6 
1,059 
30.7 
5.3 
63, 987 
110 
16. 9 
7.6 
1,052 
30.4 
5. 1 
61,237 
125 
16.9 
7.5 
1, 123 
30.7 
4.7 
63,987 
III. LAKE KEOKUK 4 
27.8 
7.5 
285 
27.8 
6.7 
1, 170 
27. 5 
7.5 
287 
28.0 
6.6 
1, 170 
27.0 
7. 5 
285 
28.3 
5.8 
1, 103 
27.0 
7.5 
290 
28.3 
5.4 
1,065 
1 Tennessee River near Florence, Ala., station 385, July 30, 1931, air temperat ure 31.3° C. A deep river lake showing midsummer 
stratification. 
] Rio Grande River, near Hot Springs, N. Mex., station 829, June 15, 1935, air temperature 33.0° C. A deep lake showing 
partial stratification at time of these observations. 
s Surface, i. e., top 12 inches of water. 
‘Mississippi River near Keokuk, Iowa, station 80, Sept. 22, 1932, air temperature 30.3° C. A medium to shallow river lake 
showing little or no stratification. 
TEMPERATURE 
As the temperature of the water has bearing on several factors associated with 
the general problems of pollution, such as dissolved oxygen carrying power of the 
water, the rate of bacterial decomposition of organic pollutants, and the metabolic 
demands of the aquatic organisms themselves, the temperature range of flowing 
streams and river lakes during the warm season is presented in table 5. These data 
include no headwaters in mountainous regions, and give, therefore, the water tem- 
perature range to be expected in the average inland stream of the United States 
during the summer months, which season as has been pointed out under the dis- 
cussion of dissolved oxygen presents certain specific pollution hazards. 
