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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-Day Average Streamflow
 
02049500 BLACKWATER RIVER NEAR FRANKLIN, VA
LOCATION.--Latitude 36°45'45", Longitude 76°53'55", North American Datum of 1927,
                    Southampton County, VA, Hydrologic Unit 03010202.
DRAINAGE AREA.--613 square miles.
PERIOD OF RECORD.--August 1944 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--Some regulation by dam and pumping station 1.4 mile above gage. Diversion of water 1.4 mile above gage. Reversed flow by tide some year, caution under 20 cfs.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02049500 plot. BLACKWATER RIVER NEAR FRANKLIN, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 03/22/2017 is 603.71 cubic feet per second.

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


                02049500     BLACKWATER RIVER NEAR FRANKLIN, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
3.51
108
253
480
769
1,200
1,710
1,980
3,670
 
71
February
18.1
303
400
574
991
1,510
1,950
2,440
5,160
 
71
March
91.0
345
471
662
1,030
1,590
2,180
2,580
4,650
 
71
April
62.8
183
277
524
840
1,350
1,850
2,330
4,200
 
71
May
4.06
64.1
109
251
476
737
1,250
1,770
3,360
 
71
June
1.27
10.7
23.5
90.5
234
512
916
1,350
3,750
 
71
July
0.28
3.03
5.92
20.1
107
350
843
1,140
4,200
 
71
August
0.00
2.48
4.17
18.0
139
410
1,070
1,640
4,370
 
71
September
0.14
2.11
3.65
9.91
52.7
397
1,460
2,290
11,300
 
71
October
0.20
1.99
3.45
9.91
67.4
366
1,250
1,980
9,070
 
71
November
0.79
3.00
5.57
29.5
165
550
1,090
1,550
3,320
 
71
December
1.12
15.2
41.4
192
434
867
1,370
1,870
3,180
 
71
 
       

The current 14-day running-average value for 03/22/2017 is 603.71 cubic feet per second.

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

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