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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of Daily Streamflow
 
01672500 SOUTH ANNA RIVER NEAR ASHLAND, VA
LOCATION.--Latitude 37°47'48", Longitude 77°32'57", North American Datum of 1927,
                    Hanover County, VA, Hydrologic Unit 02080106.
DRAINAGE AREA.--395 square miles.
PERIOD OF RECORD.--October 1930 to September 1997, June 2003 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2007.
REGULATION.--Small diurnal fluctuation at low flow in some years caused by mills upstream from station. Since 1966, diversion upstream averaged less than 0.6 cfs. Capacity of the diversion is about 1.5 cfs.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with Daily Streamflow Conditions
Provisional Data Subject to Revision 01672500 plot. SOUTH ANNA RIVER NEAR ASHLAND, VA
Provisional Data Subject to Revision

                    

The current daily value for 08/27/2008 is 13 cubic feet per second.

  explanation   Percentile Description Duration Plot Description 28 Day 14 Day 7 Day Daily
      Duration Table of Daily Streamflow
            Flow values in cubic feet per second


                01672500     SOUTH ANNA RIVER NEAR ASHLAND, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
46.0
86.0
129
220
340
551
1,180
1,890
5,360
 
71
February
45.0
130
168
264
392
630
1,160
1,700
7,560
 
71
March
70.0
178
215
287
422
678
1,390
1,970
6,720
 
71
April
103
152
175
242
354
583
1,160
1,800
12,800
 
71
May
54.0
96.0
112
155
226
365
641
1,070
6,650
 
71
June
21.0
53.0
62.0
85.0
131
215
403
707
11,100
 
71
July
13.0
32.0
39.0
58.0
95.5
162
355
690
3,880
 
72
August
5.00
18.0
24.0
44.0
78.0
150
352
704
16,000
 
72
September
2.30
11.0
17.0
29.0
65.0
123
298
724
6,510
 
72
October
4.10
13.0
22.0
45.0
86.0
170
418
948
9,300
 
71
November
12.0
40.0
53.0
87.0
142
286
606
1,110
6,520
 
71
December
30.0
70.0
86.0
140
240
418
860
1,430
7,170
 
71
 
       
Instantaneous minimum flow for period of record = 0.10 cubic feet per second.

The current daily value for 08/27/2008 is 13 cubic feet per second.

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

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