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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-Day Average Streamflow
 
02047500 BLACKWATER RIVER NEAR DENDRON, VA
LOCATION.--Latitude 37°01'30", Longitude 76°52'30", North American Datum of 1927,
                    Surry County, VA, Hydrologic Unit 03010202.
DRAINAGE AREA.--290 square miles.
PERIOD OF RECORD.--October 1941 to December 1986, July 1988 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--No known regulation.
GAGE OPERATION.--Virginia Department of Environmental Quality - Water Division.
     Duration Plot with 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02047500 plot. BLACKWATER RIVER NEAR DENDRON, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 03/22/2017 is 206.86 cubic feet per second.

  explanation   Percentile Description Duration Plot Description 28 Day 14 Day 7 Day Daily
      Duration Table of 28-Day Average Streamflow
            Flow values in cubic feet per second


                02047500     BLACKWATER RIVER NEAR DENDRON, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
3.65
25.0
99.5
203
350
563
765
948
1,580
 
72
February
21.2
131
192
274
450
670
935
1,160
2,010
 
72
March
41.6
156
237
333
516
747
1,100
1,190
1,640
 
72
April
21.0
126
193
313
500
682
947
1,130
1,790
 
72
May
18.9
63.4
92.4
159
277
442
660
880
1,270
 
72
June
0.00
10.9
22.7
60.2
128
257
442
611
1,130
 
72
July
0.00
0.44
1.97
18.9
61.0
162
350
455
1,510
 
72
August
0.00
0.01
1.43
9.73
72.4
217
477
755
1,810
 
72
September
0.00
0.00
0.00
6.17
39.7
185
594
915
2,520
 
73
October
0.00
0.00
0.03
6.34
37.0
197
692
1,100
2,580
 
72
November
0.00
0.00
0.66
22.8
87.3
233
520
777
1,900
 
73
December
0.00
2.12
22.5
85.4
185
403
663
899
1,420
 
73
 
       

The current 28-day running-average value for 03/22/2017 is 206.86 cubic feet per second.

---- Provisional Data Subject to Revision ----

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