Table 1. Travel time of tracer between tracer-monitoring sites in Daisy Creek and the Stillwater River, Montana, August 24-25, 1999
[Chloride
concentrations are dissolved.
Abbreviations: C50,
concentration midway between the plateau and ambient concentrations; mg/L
milligrams per liter]
Tracer-monitoring site (fig. 2) |
Site number (fig. 2) |
Chloride concentration (mg/L) |
Arrival time (minutes) |
Travel time through
subreach1 (minutes) |
Average velocity within subreach1 (feet per second) |
||
|
|
Pre-injection |
Plateau |
C50 |
|
|
|
T-1 |
104 |
0.45 |
118 |
59.2 |
7 |
7 |
0.25 |
T-2 |
1,340 |
.58 |
29.0 |
14.8 |
46 |
39 |
.53 |
T-3 |
9,925 |
.76 |
8.90 |
4.83 |
2577 |
2531 |
.27 |
T-4 |
12,410 |
.21 |
1.70 |
.96 |
3720 |
3143 |
.29 |
1Subreach is defined as the reach between
the indicated site and the next upstream tracer-monitoring site or, for site
T-1, the tracer-injection site. 2Arrival and travel times are approximate
because samples were collected every 2 to 4 hours, which limited the temporal
resolution. 3Arrival and travel times are estimated
from data for departure of tracer because data for tracer arrival indicated
that tracer arrived at site T-4 prior to tracer arrival at site T-3. |