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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-Day Average Streamflow
 
02054500 ROANOKE RIVER AT LAFAYETTE, VA
LOCATION.--Latitude 37°14'11", Longitude 80°12'34", North American Datum of 1927,
                    Montgomery County, VA, Hydrologic Unit 03010101
DRAINAGE AREA.--254 square miles.
PERIOD OF RECORD.--September 1943 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--Diurnal fluctuation by plant for unknown years.
GAGE OPERATION.--Virginia Department of Environmental Quality - Water Division.
     Duration Plot with 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054500 plot. ROANOKE RIVER AT LAFAYETTE, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 03/22/2017 is 144.46 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


                02054500     ROANOKE RIVER AT LAFAYETTE, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
33.0
59.6
77.2
134
225
352
466
597
813
 
72
February
47.1
78.7
96.8
170
299
464
576
682
1,280
 
72
March
42.5
102
134
245
368
534
718
841
1,410
 
72
April
76.6
126
165
244
391
599
788
901
1,550
 
72
May
82.0
113
139
189
282
427
602
716
1,550
 
72
June
43.0
77.3
90.1
124
178
274
440
573
970
 
72
July
31.5
45.3
55.2
73.8
104
153
291
533
1,060
 
72
August
21.1
41.3
48.7
62.5
84.0
119
194
280
619
 
72
September
21.5
37.9
42.1
51.8
73.4
115
230
308
687
 
72
October
30.4
36.0
38.5
55.8
73.9
130
271
472
859
 
71
November
29.8
44.3
51.1
64.1
91.3
188
327
482
816
 
72
December
32.5
46.4
51.0
77.5
153
284
420
540
1,020
 
72
 
       

The current 28-day running-average value for 03/22/2017 is 144.46 cubic feet per second.

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

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