Table 2. Streamflow and specific conductance measurements used in seepage analysis, Johnson Creek, Oregon.
[Map numbers are shown in table 1. Streamflow: (a) from rating curve; (b) measured at RM 2.4; (c) from rating curve at Johnson Creek at Milwaukie, Oregon (map number 41), less flow of Crystal Springs Creek (map number 40); (d) sum of streamflow measurements at map number 37 and map number 40. Abbreviations: ft3/s: cubic foot per second, µS/cm: microsiemens per centimeter at 25 degrees Celsius, RM: river mile]
Map
No. |
Site name
Johnson Creek at: |
River mile |
September 1988 |
|
September 1997 |
|
August 1998 |
|
August 1999 |
|
September 1999 |
|
August 2000 |
|
October 2006 |
Streamflow (ft3/s) |
Streamflow (ft3/s) |
Streamflow (ft3/s) |
Specific conduc-tance (µS/cm) |
Streamflow (ft3/s) |
Specific conduc-tance (µS/cm) |
Streamflow (ft3/s) |
Specific conduc-tance (µS/cm) |
Streamflow (ft3/s) |
Streamflow (ft3/s) |
Specific conductance (µS/cm) |
25 |
Palmblad Road |
17.2 |
0.08 |
|
– |
|
0.81 |
123 |
|
0.86 |
137 |
|
– |
– |
|
0.49 |
|
0.59 |
129 |
26 |
Regner Road |
15.8 |
– |
– |
1.02 |
137 |
1.02 |
139 |
– |
– |
.72 (a) |
1.49 |
140 |
27 |
Walters Road |
14.5 |
.42 |
– |
1.36 |
145 |
1.24 |
148 |
– |
– |
.70 |
– |
– |
28 |
190th Avenue |
12.6 |
.47 |
– |
1.83 |
147 |
1.62 |
139 |
– |
– |
1.16 |
– |
– |
30 |
Sycamore |
10.2 |
.64 (a) |
5.2 (a) |
2.52 |
152 |
2.25 |
146 |
1.96 (a) |
152 |
1.77 (a) |
2.41 |
152 |
31 |
Brookside Park |
7.8 |
.74 |
– |
2.38 |
149 |
– |
– |
1.87 |
152 |
1.46 |
– |
– |
32 |
82nd Avenue |
5.5 |
.92 |
4.8 |
2.43 |
151 |
– |
– |
2.02 |
140 |
1.31 |
2.46 |
143 |
33 |
45th Avenue |
3.2 |
1.35 |
6.1 |
3.56 |
200 |
– |
– |
3.50 |
206 |
2.36 |
2.62 |
175 |
36 |
Berkeley Place |
2.2 |
3.45 (b) |
– |
5.53 |
226 |
– |
– |
5.90 |
228 |
3.99 |
3.35 |
194 |
37 |
Sherrett Street |
1.2 |
2.91 |
9.9 (c) |
5.69 |
222 |
– |
– |
5.55 |
226 |
3.55 |
3.54 |
192 |
41 |
Milwaukie |
0.7 |
13.4 (d) |
31.0 (a) |
21.8 |
218 |
– |
– |
22.0 (a) |
– |
17.0 |
14.0 |
195 |
Summary: Seepage values in bold are greater than the measurement uncertainty |
Upper reach |
RM 17.2 to RM 10.2 |
|
0.56 |
|
– |
|
1.71 |
| |
1.39 |
| |
– |
| |
1.28 |
|
1.82 |
|
Middle reach |
RM 10.2 to RM 5.5 |
.28 |
-0.4 |
-0.09 |
|
– |
|
0.06 |
|
-.46 |
.05 |
|
Lower reach |
RM 5.5 to RM 0.7 |
12.5 |
26.2 |
19.4 |
|
– |
|
20.0 |
|
15.7 |
11.5 |
|
|
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