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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-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 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054500 plot. ROANOKE RIVER AT LAFAYETTE, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 03/22/2017 is 135.71 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


                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
14.3
57.1
69.0
132
219
366
534
691
1,220
 
72
February
39.1
73.4
93.4
155
284
471
695
868
1,610
 
72
March
38.4
99.6
123
234
373
538
807
984
1,880
 
72
April
70.5
115
146
203
330
563
858
1,020
2,540
 
72
May
71.1
96.8
116
161
243
380
590
705
2,310
 
72
June
35.4
60.7
74.7
103
142
243
405
587
1,530
 
72
July
28.9
43.8
51.2
65.9
94.0
136
217
366
1,570
 
72
August
17.4
36.1
42.8
57.1
76.4
117
197
299
1,050
 
72
September
19.6
36.4
39.9
48.6
64.5
104
205
373
1,110
 
72
October
28.1
34.9
38.6
53.1
73.3
126
258
426
1,250
 
71
November
29.5
42.6
49.6
63.1
92.8
169
382
499
1,270
 
72
December
32.9
46.2
52.4
80.6
160
279
468
628
1,380
 
72
 
       

The current 14-day running-average value for 03/22/2017 is 135.71 cubic feet per second.

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

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