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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-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REGULATION.--Withdrawn estimated 11.1 cfs, unknown years.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 7-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054530 plot. ROANOKE RIVER AT GLENVAR, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 03/22/2017 is 167.43 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


                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
41.9
56.3
68.2
101
213
345
713
940
2,100
 
24
February
51.9
71.7
81.0
105
210
453
959
1,440
3,160
 
24
March
49.9
83.4
88.9
199
351
542
953
1,360
3,590
 
24
April
81.4
103
115
189
296
501
875
1,260
2,870
 
24
May
78.6
99.9
113
144
220
421
657
794
1,860
 
24
June
39.6
52.9
65.9
93.0
140
268
601
839
2,460
 
24
July
35.1
47.8
55.2
70.5
99.4
151
255
530
2,510
 
24
August
18.0
28.2
34.9
57.4
77.4
119
172
261
819
 
24
September
17.9
33.3
38.7
49.0
69.1
101
229
442
2,220
 
24
October
30.1
35.4
40.9
54.9
75.7
110
187
238
2,410
 
23
November
33.1
43.4
46.6
63.7
84.1
147
373
584
1,750
 
23
December
42.3
48.4
53.9
77.4
135
313
566
888
2,040
 
23
 
       

The current 7-day running-average value for 03/22/2017 is 167.43 cubic feet per second.

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

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