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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-Day Average Streamflow
 
03170000 LITTLE RIVER AT GRAYSONTOWN, VA
LOCATION.--Latitude 37°02'15", Longitude 80°33'25", North American Datum of 1927,
                    Pulaski County, VA, Hydrologic Unit 05050001.
DRAINAGE AREA.--309 square miles.
PERIOD OF RECORD.--October 1928 to current year. Published as "at Graysonton" prior to October 1990.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--No known regulation.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with 7-Day Average Streamflow Conditions
Provisional Data Subject to Revision 03170000 plot. LITTLE RIVER AT GRAYSONTOWN, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 03/22/2017 is 249.29 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


                03170000     LITTLE RIVER AT GRAYSONTOWN, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
86.9
122
145
216
328
474
734
941
2,120
 
87
February
71.0
141
170
266
389
557
783
1,000
2,380
 
87
March
66.0
197
236
327
445
618
906
1,130
2,710
 
87
April
117
220
239
292
416
597
895
1,100
2,790
 
87
May
110
187
209
262
370
503
654
822
2,250
 
87
June
73.1
128
156
218
293
409
582
741
2,680
 
87
July
56.7
101
122
172
232
309
430
589
2,280
 
87
August
32.0
82.7
101
144
197
272
389
549
4,480
 
87
September
46.3
80.6
98.9
129
175
247
440
672
2,950
 
87
October
64.3
86.9
104
138
190
303
514
749
2,820
 
86
November
69.6
115
131
165
222
341
523
658
2,480
 
87
December
90.0
121
137
187
279
406
582
760
2,270
 
87
 
       

The current 7-day running-average value for 03/22/2017 is 249.29 cubic feet per second.

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

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