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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-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 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02056900 plot. BLACKWATER RIVER NEAR ROCKY MOUNT, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 03/22/2017 is 84.79 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


                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
27.8
46.9
53.5
81.2
128
177
222
255
408
 
39
February
39.6
54.3
60.0
80.1
133
188
274
399
577
 
39
March
39.1
60.5
71.4
111
154
239
326
405
629
 
39
April
54.4
69.7
82.2
108
173
263
337
526
856
 
39
May
45.1
60.7
66.9
94.4
143
191
277
471
857
 
39
June
16.2
38.2
48.8
75.5
108
153
269
314
442
 
39
July
14.3
25.0
29.5
48.1
74.7
114
243
315
432
 
39
August
5.18
16.1
20.7
35.8
61.8
88.9
134
189
281
 
39
September
11.0
19.4
22.9
32.5
56.2
93.7
179
297
397
 
39
October
13.7
20.3
24.4
39.0
51.5
79.0
165
316
594
 
38
November
17.5
29.9
34.1
49.5
72.0
121
190
323
616
 
39
December
22.3
33.0
38.4
60.0
115
153
232
275
559
 
39
 
       

The current 28-day running-average value for 03/22/2017 is 84.79 cubic feet per second.

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

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