| Site ID: |
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1002 |
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Lat. |
37.2541 |
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USA |
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Virginia |
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| River: |
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Roanoke |
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Long. |
-79.9445 |
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| Site name: |
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Roanoke |
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Contributing
area: |
1385 |
km2 |
Ratio to Comparison
Station: |
0.06 |
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| Latest measurement: |
15-Nov-09 |
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Mean annual
runoff: |
605 |
mm |
(2003-2007) |
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| Hydrologic status: |
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2 |
Normal flow |
Total runoff
this year: |
1334 |
mm |
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| Latest M/C ratio: |
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1.10 |
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Seven day
total: |
1 |
mm |
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| Estimated current discharge: |
3 |
m3/sec |
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Percent of
mean 7-day total: |
169.4 |
% |
(today's value compared to
mean for same period, 2003-2007) |
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| Ice-cover determination: |
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5 yr
recurrence flood: |
521 |
m3/sec |
(from Log Pearson III
analysis) |
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| Status Codes: 1 = Low
flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood |
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511 |
m3/sec |
(from Gumbel Extreme Value
analysis) |
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| Comparison Station Information: |
Tokwe
Confluence D/s C/s (1495240) |
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Contributing
Area: |
7280 |
sq mi |
23237 |
sq km |
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| (Data from this gaging station are used for the calibration to
discharge, with an adjustment for different contributing areas) |
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| Notes: |
Comparison station is
placeholder, only; this site is not yet calibrated to actual discharge |
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| Discharge and runoff, based on satellite remote sensing (NASA
AMSR-E data) |
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| (For U.S, sites, nearby ground station discharge may also be
shown) |
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2008-Present |
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2002-Present |
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| Annual |
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Monthly Total Runoff (mm),
computed from above satellite-based discharge data |
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| Runoff |
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| (mm) |
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Jan |
Feb |
Mar |
April |
May |
June |
July |
Aug |
Sept |
Oct |
Nov |
Dec |
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| 54 |
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2002 |
no data |
no data |
no data |
no data |
no data |
no data |
no data |
21.1 |
10.7 |
9.3 |
6.2 |
6.4 |
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| 187 |
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2003 |
6.4 |
5.8 |
6.4 |
19.8 |
9.3 |
17.4 |
6.4 |
91.6 |
6.2 |
6.4 |
4.8 |
6.4 |
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| 174 |
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2004 |
6.4 |
6.0 |
6.4 |
6.2 |
84.6 |
8.5 |
9.3 |
6.4 |
10.9 |
16.3 |
6.2 |
6.4 |
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| 619 |
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2005 |
6.4 |
5.8 |
14.6 |
66.5 |
22.7 |
17.0 |
7.0 |
29.9 |
87.6 |
118.5 |
150.9 |
92.4 |
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| 724 |
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2006 |
86.0 |
59.6 |
137.7 |
106.4 |
71.6 |
112.9 |
46.8 |
32.3 |
20.4 |
50.6 |
0.0 |
0.0 |
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| 1320 |
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2007 |
176.9 |
71.2 |
146.6 |
148.3 |
82.0 |
75.2 |
132.2 |
147.7 |
107.4 |
52.0 |
82.0 |
98.4 |
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| 1334 |
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2008 |
135.5 |
160.8 |
104.2 |
181.8 |
27.0 |
32.5 |
76.0 |
269.2 |
98.9 |
55.8 |
109.9 |
82.8 |
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| 875 |
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2009 |
95.0 |
78.2 |
129.6 |
143.1 |
125.8 |
30.2 |
43.3 |
77.8 |
68.1 |
53.4 |
30.6 |
0.0 |
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| Discharge is estimated directly via a rating equation from
the remote sensing data (M/C ratio) shown below. |
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