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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-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REGULATION.--Withdrawn estimated 11.1 cfs, unknown years.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 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054530 plot. ROANOKE RIVER AT GLENVAR, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 03/22/2017 is 168.25 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


                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
48.9
63.4
70.7
108
247
398
532
582
982
 
23
February
61.8
75.9
83.4
123
263
533
796
1,010
1,490
 
24
March
56.2
83.8
93.8
201
374
600
913
1,120
1,800
 
24
April
90.8
104
149
251
366
566
919
965
1,650
 
24
May
95.6
124
148
203
308
485
675
785
1,250
 
24
June
53.0
70.4
84.5
118
200
377
616
733
1,050
 
24
July
42.9
49.9
53.6
86.2
112
188
693
859
1,200
 
24
August
25.2
37.6
44.6
65.5
90.2
124
264
310
597
 
24
September
25.3
35.0
43.3
53.5
78.4
123
269
380
924
 
24
October
34.0
39.4
41.2
58.4
77.5
97.2
197
270
987
 
23
November
35.2
42.3
50.7
67.5
80.5
145
277
373
569
 
23
December
40.5
48.6
52.9
70.4
165
374
575
746
994
 
23
 
       

The current 28-day running-average value for 03/22/2017 is 168.25 cubic feet per second.

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

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