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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-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 7-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02047500 plot. BLACKWATER RIVER NEAR DENDRON, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 03/22/2017 is 427.57 cubic feet per second.

  explanation   Percentile Description Duration Plot Description 28 Day 14 Day 7 Day Daily
      Duration Table of 7-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
3.41
41.0
108
213
363
573
890
1,190
2,680
 
72
February
29.4
110
162
245
446
688
992
1,330
2,900
 
72
March
22.0
142
201
303
478
757
1,170
1,450
3,730
 
72
April
18.6
85.4
110
215
376
638
980
1,260
2,580
 
72
May
2.86
24.1
37.7
83.6
177
344
570
848
2,130
 
72
June
0.00
0.57
2.72
20.6
71.7
187
394
638
3,300
 
72
July
0.00
0.00
0.01
4.08
30.7
150
380
559
3,880
 
72
August
0.00
0.00
0.00
4.84
34.4
173
446
904
2,500
 
72
September
0.00
0.00
0.00
1.20
19.0
96.2
611
1,310
7,710
 
73
October
0.00
0.00
0.00
2.79
35.7
156
453
750
6,140
 
72
November
0.00
0.00
0.89
31.0
93.4
262
516
813
2,200
 
73
December
0.00
3.18
25.9
101
220
426
755
1,080
1,970
 
73
 
       

The current 7-day running-average value for 03/22/2017 is 427.57 cubic feet per second.

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

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