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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-Day Average Streamflow
 
02054530 ROANOKE RIVER AT GLENVAR, VA
LOCATION.--Latitude 37°16'04", Longitude 80°08'23", North American Datum of 1927,
                    Roanoke County, VA, Hydrologic Unit 03010101.
DRAINAGE AREA.--281 square miles.
PERIOD OF RECORD.--December 1991 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--Withdrawn estimated 11.1 cfs, unknown years.
GAGE OPERATION.--Virginia Department of Environmental Quality - Water Division.
     Duration Plot with 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054530 plot. ROANOKE RIVER AT GLENVAR, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 03/22/2017 is 161.5 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


                02054530     ROANOKE RIVER AT GLENVAR, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
46.3
54.9
72.3
103
223
404
625
952
1,520
 
24
February
55.1
73.9
79.9
108
237
461
870
1,230
1,950
 
24
March
53.1
84.0
92.2
208
387
588
947
1,190
2,410
 
24
April
84.1
101
123
218
328
555
892
1,300
2,380
 
24
May
87.9
106
123
162
265
438
672
846
1,600
 
24
June
44.1
54.1
73.3
101
150
333
576
783
1,450
 
24
July
35.5
49.6
54.6
76.7
102
154
321
942
1,620
 
24
August
20.8
30.1
39.5
61.4
80.4
118
203
324
488
 
24
September
22.9
32.8
42.9
50.5
69.6
110
266
456
1,360
 
24
October
32.4
36.7
40.9
55.5
76.7
105
195
244
1,370
 
23
November
33.6
43.3
46.6
65.3
82.6
133
359
464
990
 
23
December
41.3
48.7
53.4
73.4
146
326
610
787
1,280
 
23
 
       

The current 14-day running-average value for 03/22/2017 is 161.5 cubic feet per second.

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

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