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Open-File Report 99-219 contents page

 
Table 2. Surface area, in hectares, covered by submersed aquatic vegetation in the tidal Potomac River and Potomac Estuary for the period 1983 through 1997, for USGS segments UTR and LTR, and Chesapeake Bay Program segments TF2, POTOH, and POTMH (n.d. = no data; see Figure 1 for location of river segments)
YEAR
UTR
LTR
TF2
POTOH
POTMH
1983
200.00
0.00
200.00
n.d.
n.d.
1984
619.51
0.00
619.51
217.09
59.90
1985
1375.50
0.41
1375.91
431.80
55.61
1986
1554.20
56.54
1610.74
383.87
43.12
1987
1465.06
113.17
1578.23
484.95
49.64
1988
1267.00
140.00
1407.00
434.00
n.d.
1989
586.75
717.55
1304.30
1216.19
100.83
1990
627.81
1010.95
1638.75
1308.19
108.77
1991
837.09
1207.11
2044.20
1414.87
136.75
1992
435.99
976.42
1412.41
1501.17
96.58
1993
479.01
933.85
1412.86
1296.74
110.07
1994
412.29
569.97
982.26
1255.18
194.55
1995
419.17
224.45
643.61
1023.53
239.17
1996
272.40
470.28
742.69
1036.66
402.40
1997
364.41
363.23
727.64
1206.26
666.84

 

 

Table 3. Surface area, in hectares, covered by submersed aquatic vegetation in the tidal Potomac River and Potomac Estuary for the period 1983 through 1997, for water-quality monitoring station segments (n.d. = no data; see Figure 1 for location of monitoring stations)
YEAR
XFB2470
XFB1433
XEA6596
XEA1840
XDA4238
XDA1177
XDC1706
MLE2.2
MLE2.3
1983
0.00
0.00
0.00
0.00
n.d.
n.d.
n.d.
n.d.
n.d.
1984
254.82
30.19
0.00
0.00
0.00
17.13
4.48
0.00
0.00
1985
499.35
108.99
0.41
8.99
5.41
22.35
5.61
0.00
2.18
1986
647.21
171.63
2.14
10.31
7.08
16.41
7.56
0.00
0.69
1987
618.33
136.62
10.05
33.59
4.84
12.13
19.97
0.00
0.00
1988
540.00
146.00
9.00
94.00
15.00
4.00
n.d.
n.d.
n.d.
1989
81.15
118.07
31.77
232.72
55.96
49.09
54.65
0.00
0.00
1990
101.92
113.28
42.55
333.04
207.70
49.17
54.70
0.00
0.00
1991
222.23
156.97
74.44
342.48
201.22
61.03
53.33
0.00
0.00
1992
45.63
45.61
60.09
337.19
163.86
71.16
49.52
0.00
0.00
1993
39.47
45.54
71.74
351.54
172.17
75.28
50.86
0.00
0.00
1994
40.11
15.24
21.68
298.49
157.61
76.87
59.35
0.00
0.00
1995
46.53
16.06
16.77
71.03
78.94
82.14
57.51
21.69
0.00
1996
49.70
24.19
37.89
87.60
64.20
58.05
60.63
49.51
0.00
1997
122.41
30.62
36.16
24.25
49.46
35.06
71.97
63.74
0.00

 

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