APPENDIX B: DATA FOR FALLING HEAD
PERCOLATION TESTS IN BASIN
The following data were obtained from falling water percolation tests conducted in June of
1996 to determine the state of the retention basin liner. The barrels were sealed with local mate-
rial: no bentonite was used. For reference, work done in 1994 by Chamberlain and Walsh
(Racine and Cate 1995, Walsh et al. 1996) showed that percolation rates of Flats water through
the gravel base below the basin were on the order of 103 cm/sec.
Table B1. Basin percolation barrel tests data--1996.
Barrel S-3*
Barrel S-4*
Elapsed Head Percolation
Elapsed Head
Percolation
time
drop
rate
time
drop
rate
Date
Time
(min) (cm)
(cm/s)
Time
(min) (cm)
(cm/s)
10 June
9:30
0
0.0
--
9:38
0
0.0
--
9:45
15
10.0
1.39 E-02
9:53
15
7.0
9.00 E-03
10:00
15
4.0
4.81 E-03
10:08
15
3.5
4.17 E-03
10:15
15
2.8
3.28 E-03
10:23
15
2.8
3.28 E-03
10:30
15
2.5
2.91 E-03
10:38
15
2.6
3.04 E-03
10:45
15
1.2
1.36 E-03
10:53
15
2.3
2.67 E-03
11:00
15
1.2
1.36 E-03
11:08
15
2.0
2.31 E-03
11:35
35
3.3
1.68 E-03
11:38
30
3.7
2.21 E-03
13:15
100
7.0
1.35 E-03
13:18
100
9.3
1.90 E-03
13:45
30
1.8
1.03 E-03
13:48
30
2.3
1.34 E-03
14:15
30
1.4
7.99 E-04
14:18
30
2.6
1.52 E-03
14:45
30
1.4
7.99 E-04
14:48
30
2.1
1.21 E-03
15:23
38
2.0
9.11 E-04
15:25
37
3.1
1.48 E-03
15:50
27
1.2
7.58 E-04
15:52
27
2.0
1.28 E-03
16:20
30
1.2
6.82 E-04
16:23
31
2.2
1.23 E-03
16:56
36
1.2
5.68 E-04
16:58
35
2.1
1.04 E-03
11 June
8:30
934
27.0
--
8:30
34,052
27.0
--
10:38
128
7.5
1.14 E-03
10:40
130
2.6
3.50 E-04
11:12
34
0.3
1.48 E-04
11:15
35
1.9
9.38 E-04
14:51
219
4.5
3.75 E-04
14:50
215
10.7
1.06 E-03
15:30
39
0.6
2.59 E-04
15:33
43
2.2
8.89 E-04
12 June
9:51
1101
20.2
5.64 E-04
9:49
34,216
27
--
10:22
31
0.5
2.71 E-04
10:19
30
1.8
1.03 E-03
10:52
30
0.3
1.68 E-04
10:49
30
1.2
6.82 E-04
11:25
33
0.3
1.52 E-04
11:22
33
1.2
6.20 E-04
* Barrels 39.3 cm diam with 27 cm water when full.
Material thickness: Barrel S-3: 34 cm
Barrel S-4: 13.5 cm
25
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