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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-Day Average Streamflow
 
02056900 BLACKWATER RIVER NEAR ROCKY MOUNT, VA
LOCATION.--Latitude 37°02'42", Longitude 79°50'40", North American Datum of 1927,
                    Franklin County, VA, Hydrologic Unit 03010101.
DRAINAGE AREA.--115 square miles.
PERIOD OF RECORD.--October 1976 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 02056900 plot. BLACKWATER RIVER NEAR ROCKY MOUNT, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 03/22/2017 is 83.14 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


                02056900     BLACKWATER RIVER NEAR ROCKY MOUNT, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
23.9
41.8
53.1
72.8
112
173
286
391
881
 
39
February
33.0
50.3
56.4
77.0
121
172
277
354
884
 
39
March
32.3
58.2
69.1
108
158
228
357
454
1,060
 
39
April
45.9
64.4
69.3
90.6
149
231
429
609
1,510
 
39
May
31.0
49.6
57.4
84.9
125
168
221
310
1,550
 
39
June
8.79
26.7
36.3
59.8
90.7
127
253
405
1,080
 
39
July
8.93
19.2
25.7
42.2
64.3
92.4
155
237
1,080
 
39
August
3.37
10.5
16.3
30.2
49.9
79.9
129
202
632
 
39
September
7.11
17.0
21.2
30.9
46.9
78.3
157
323
1,180
 
39
October
11.3
15.9
24.9
37.9
52.0
84.3
167
269
1,250
 
38
November
17.3
28.8
32.7
50.8
70.0
121
186
278
1,860
 
39
December
21.7
32.5
40.4
58.9
105
159
233
295
569
 
39
 
       

The current 7-day running-average value for 03/22/2017 is 83.14 cubic feet per second.

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

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