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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-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 7-Day Average Streamflow Conditions
Provisional Data Subject to Revision 02054500 plot. ROANOKE RIVER AT LAFAYETTE, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 03/22/2017 is 141.14 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


                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
11.1
53.6
64.2
123
204
352
601
815
1,800
 
72
February
36.4
67.8
89.1
148
266
469
733
1,010
2,450
 
72
March
35.0
95.1
119
216
351
544
847
1,140
2,550
 
72
April
68.0
109
131
187
289
508
834
1,170
3,150
 
72
May
61.3
89.1
106
148
216
355
581
789
3,350
 
72
June
33.0
54.1
67.4
95.0
130
215
385
591
2,690
 
72
July
25.4
41.7
49.1
63.4
87.9
127
204
290
1,860
 
72
August
15.4
33.2
39.1
53.1
71.7
113
187
271
1,840
 
72
September
15.4
33.7
38.0
47.1
62.6
96.6
202
357
1,590
 
72
October
26.3
34.1
38.7
52.1
72.7
124
254
436
1,740
 
71
November
28.9
41.6
48.9
62.4
89.6
168
336
560
2,240
 
72
December
28.9
45.1
51.9
80.6
148
274
481
675
2,040
 
72
 
       

The current 7-day running-average value for 03/22/2017 is 141.14 cubic feet per second.

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

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