USGS - science for a changing world
Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-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 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02049500 plot. BLACKWATER RIVER NEAR FRANKLIN, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 03/22/2017 is 400.61 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


                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
2.55
79.6
229
446
751
1,190
1,490
1,750
2,680
 
71
February
13.1
317
423
622
995
1,420
1,840
2,170
3,800
 
71
March
148
391
489
694
1,090
1,560
2,050
2,350
3,410
 
71
April
66.0
237
419
641
958
1,360
1,890
2,290
3,360
 
71
May
9.71
118
188
364
565
874
1,460
1,820
2,770
 
71
June
5.05
30.8
57.3
148
314
535
890
1,380
2,690
 
71
July
0.66
4.95
10.5
42.2
153
413
794
1,070
2,200
 
71
August
0.04
3.68
7.18
30.8
183
461
953
1,330
3,290
 
71
September
0.08
2.92
4.22
15.7
104
522
1,370
1,830
6,350
 
71
October
0.31
2.82
4.58
13.5
76.0
473
1,470
1,870
6,470
 
71
November
0.94
3.18
6.14
26.1
144
541
1,080
1,410
4,870
 
71
December
1.66
10.7
37.0
168
385
798
1,290
1,760
2,610
 
71
 
       

The current 28-day running-average value for 03/22/2017 is 400.61 cubic feet per second.

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

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://va.water.usgs.gov/duration_plots/htm_28/dp02049500.htm
Page Contact Information: Virginia WSC Webmaster
Page Last Modified: 6/19/2016