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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 28-Day Average Streamflow
 
01668000 RAPPAHANNOCK RIVER NEAR FREDERICKSBURG, VA
LOCATION.--Latitude 38°18'30", Longitude 77°31'46", North American Datum of 1927,
                    Spotsylvania County, VA, Hydrologic Unit 02080104.
DRAINAGE AREA.--1,595 square miles.
PERIOD OF RECORD.--September 1907 to current year. Monthly discharge only for some periods, published in WSP 1302.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2007.
REGULATION.--Some regulation from powerplants and mills above station in past years (none current).
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with 28-Day Average Streamflow Conditions
Provisional Data Subject to Revision 01668000 plot. RAPPAHANNOCK RIVER NEAR FREDERICKSBURG, VA
Provisional Data Subject to Revision

                    

The current 28-day running-average value for 11/17/2008 is not determined.

  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


                01668000     RAPPAHANNOCK RIVER NEAR FREDERICKSBURG, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
155
369
663
1,120
1,710
2,610
3,650
4,440
6,890
 
100
February
172
659
869
1,360
2,030
3,090
3,950
4,800
10,600
 
100
March
226
931
1,240
1,620
2,300
3,130
4,620
5,790
9,230
 
100
April
490
879
1,100
1,580
2,230
3,300
4,820
5,620
10,000
 
100
May
474
665
799
1,150
1,720
2,730
3,900
4,660
11,200
 
100
June
171
468
552
815
1,250
2,130
3,180
3,980
11,500
 
100
July
64.2
230
311
505
825
1,240
2,090
2,740
8,420
 
100
August
18.8
101
175
362
668
1,150
2,210
2,770
7,950
 
100
September
18.8
72.5
146
252
512
1,140
2,360
3,130
8,140
 
100
October
12.6
108
141
266
520
1,340
2,650
4,010
12,100
 
99
November
16.2
178
246
412
762
1,580
2,880
3,760
12,500
 
100
December
80.2
279
382
665
1,150
2,110
3,370
4,660
6,950
 
100
 
       

The current 28-day running-average value for 11/17/2008 is not determined.

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

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