Table 2.
Sources of dissolved copper to subreaches of Daisy Creek, Montana, August 26,
1999
[Values listed for loads have been rounded. Abbreviations: μg/s, micrograms per
second. Symbol: <, less than]
|
Subreach description1 |
Subreach extent |
|
Dissolved copper load (μg/s) |
||||
|
|
Upstream
site |
Downstream
site |
|
Right-bank
inflows |
Left-bank
inflows |
Subsurface
inflow2 |
Combined
surface plus subsurface |
|
Moraine or
landslide hill |
0 |
270 |
|
461 |
<1 |
151 |
612 |
|
Manganese bog |
270 |
460 |
|
9,830 |
4 |
251 |
10,100 |
|
Southern part of
McLaren Mine area |
460 |
611 |
|
16,400 |
4 |
8,900 |
25,300 |
|
Northern part of
McLaren Mine area |
611 |
1,700 |
|
245 |
<1 |
7,040 |
7,290 |
|
Area north and
west of McLaren Mine |
1,700 |
5,475 |
|
2 |
<1 |
6,210 |
6,210 |
|
TOTAL |
|
|
|
26,900 |
8 |
22,600 |
49,500 |
|
|
|
|
|
|
|
|
|
|
1Describes area
from which metal-rich surface drainage to subreach is derived. 2Calculated as the
difference between the gain in instream load between upstream and downstream
sites and the sum of the loads in the right-bank and left-bank inflows within
the subreach. |
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