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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 3747'48", Longitude 7732'57", 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 2015.
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 02/23/2017 is 153.0 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
94.0
121
210
329
539
1,130
1,810
5,360
 
79
February
45.0
125
154
248
382
616
1,120
1,640
7,560
 
79
March
70.0
175
207
284
422
669
1,370
1,960
6,720
 
79
April
103
153
175
240
346
569
1,130
1,730
12,800
 
79
May
54.0
97.0
113
155
226
366
664
1,180
6,650
 
79
June
21.0
52.0
62.0
86.0
132
220
414
727
11,100
 
79
July
13.0
31.0
38.0
56.0
92.0
156
329
659
3,880
 
80
August
5.00
18.0
23.0
41.0
74.0
146
323
660
16,000
 
80
September
2.30
11.0
16.0
28.0
62.0
120
289
681
6,510
 
80
October
4.10
13.0
21.0
44.0
84.0
166
388
835
9,300
 
79
November
12.0
40.6
51.0
83.0
137
280
591
1,100
6,520
 
79
December
30.0
69.0
83.0
137
238
425
899
1,500
7,170
 
79
 
       
Instantaneous minimum flow for period of record = 0.10 cubic feet per second.

The current daily value for 02/23/2017 is 153.0 cubic feet per second.

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

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