SECCHI DISK CHART : Secchi depth and corresponding light level values are in meters.
Disclaimer: These values were copied off a xeroxed sheet the origin of which is unknown.
|
Secchi |
|
Light Levels |
|||||
|
depth |
k |
50% |
30% |
15% |
5% |
1% |
0.1% |
|
1 |
1.700 |
0.4 |
0.7 |
1.1 |
1.8 |
2.7 |
4.1 |
|
2 |
0.850 |
0.8 |
1.4 |
2.2 |
3.5 |
5.4 |
8.1 |
|
3 |
0.567 |
1.2 |
2.1 |
3.3 |
5.3 |
8.1 |
12.2 |
|
4 |
0.425 |
1.6 |
2.8 |
4.5 |
7.0 |
10.8 |
16.3 |
|
5 |
0.340 |
2.0 |
3.5 |
5.6 |
8.8 |
13.5 |
20.3 |
|
6 |
0.283 |
2.4 |
4.2 |
6.7 |
10.6 |
16.3 |
24.4 |
|
7 |
0.243 |
2.9 |
5.0 |
7.8 |
12.3 |
19.0 |
28.4 |
|
8 |
0.231 |
3.3 |
5.7 |
8.9 |
14.1 |
21.7 |
32.5 |
|
9 |
0.189 |
3.7 |
6.4 |
10.0 |
15.9 |
24.4 |
36.6 |
|
10 |
0.170 |
4.1 |
7.1 |
11.2 |
17.6 |
27.1 |
40.6 |
|
11 |
0.155 |
4.5 |
7.8 |
12.3 |
19.4 |
29.8 |
44.7 |
|
12 |
0.142 |
4.9 |
8.5 |
13.4 |
21.1 |
32.5 |
48.8 |
|
13 |
0.131 |
5.3 |
9.2 |
14.5 |
22.9 |
35.2 |
52.8 |
|
14 |
0.121 |
5.7 |
9.9 |
15.6 |
24.7 |
37.9 |
56.9 |
|
15 |
0.113 |
6.1 |
10.6 |
16.7 |
26.5 |
40.7 |
61.1 |
|
16 |
0.106 |
6.5 |
11.3 |
17.8 |
28.2 |
43.4 |
65.2 |
|
17 |
0.100 |
6.9 |
12.0 |
18.9 |
30.0 |
46.0 |
69.1 |
|
18 |
0.094 |
7.3 |
12.8 |
20.1 |
31.8 |
48.9 |
73.5 |
|
19 |
0.090 |
7.7 |
13.3 |
21.0 |
33.2 |
51.1 |
76.8 |
|
20 |
0.085 |
8.1 |
14.1 |
22.2 |
35.2 |
54.1 |
81.3 |
|
21 |
0.081 |
8.5 |
14.8 |
23.3 |
36.9 |
56.8 |
85.3 |
|
22 |
0.077 |
9.0 |
15.6 |
24.5 |
38.8 |
59.7 |
89.7 |
|
23 |
0.074 |
9.3 |
16.2 |
25.5 |
40.4 |
62.6 |
93.4 |
|
24 |
0.071 |
9.7 |
16.9 |
26.6 |
42.1 |
64.8 |
97.3 |
|
25 |
0.068 |
10.1 |
17.6 |
27.8 |
44.0 |
67.6 |
101.6 |
|
26 |
0.065 |
10.6 |
18.5 |
29.1 |
46.0 |
70.8 |
106.3 |
|
27 |
0.063 |
11.0 |
19.0 |
30.0 |
47.5 |
73.0 |
109.6 |
|
28 |
0.061 |
11.3 |
19.7 |
31.0 |
49.0 |
75.4 |
113.2 |
|
29 |
0.059 |
11.7 |
20.3 |
32.0 |
50.7 |
78.0 |
117.1 |
|
30 |
0.057 |
12.1 |
21.0 |
33.2 |
52.4 |
80.7 |
121.2 |
|
31 |
0.055 |
12.5 |
21.8 |
34.4 |
54.4 |
83.6 |
125.6 |
|
32 |
0.053 |
13.0 |
22.6 |
35.7 |
56.4 |
86.8 |
130.3 |
|
33 |
0.051 |
13.5 |
23.5 |
37.0 |
58.6 |
90.2 |
135.4 |
|
34 |
0.050 |
13.8 |
24.0 |
37.8 |
59.8 |
92.0 |
138.2 |
|
35 |
0.048 |
14.4 |
25.0 |
39.4 |
62.3 |
95.8 |
143.9 |
|
36 |
0.047 |
14.7 |
25.5 |
40.2 |
63.6 |
97.9 |
147.0 |
|
37 |
0.046 |
15.0 |
26.1 |
41.1 |
65.0 |
100.0 |
150.2 |
|
38 |
0.045 |
15.3 |
26.7 |
42.0 |
66.4 |
102.2 |
153.5 |
|
39 |
0.043 |
16.0 |
28.0 |
44.0 |
69.5 |
107.0 |
160.6 |
|
40 |
0.042 |
16.4 |
28.6 |
45.0 |
71.2 |
109.5 |
164.5 |
|
41 |
0.042 |
17.0 |
29.0 |
46.0 |
72.0 |
111.0 |
166.0 |
|
42 |
0.040 |
17.0 |
30.0 |
47.0 |
74.0 |
114.0 |
170.0 |
|
43 |
0.040 |
18.0 |
30.0 |
48.0 |
76.0 |
116.0 |
175.0 |
|
44 |
0.039 |
18.0 |
31.0 |
49.0 |
78.0 |
119.0 |
179.0 |
|
45 |
0.038 |
18.0 |
32.0 |
50.0 |
79.0 |
120.0 |
182.0 |
|
46 |
0.037 |
19.0 |
33.0 |
51.0 |
81.0 |
125.0 |
187.0 |
|
47 |
0.036 |
19.0 |
33.0 |
52.0 |
83.0 |
127.0 |
191.0 |
|
48 |
0.035 |
20.0 |
34.0 |
54.0 |
85.0 |
130.0 |
197.0 |
|
49 |
0.035 |
20.0 |
35.0 |
55.0 |
86.0 |
133.0 |
199.0 |
|
50 |
0.034 |
20.0 |
35.0 |
56.0 |
88.0 |
135.0 |
203.0 |
Last Updated: 03/19/2002