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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-Day Average Streamflow
 
01625000 MIDDLE RIVER NEAR GROTTOES, VA
LOCATION.--Latitude 38°15'42", Longitude 78°51'44", North American Datum of 1927,
                    Augusta County, VA, Hydrologic Unit 02070005.
DRAINAGE AREA.--373 square miles.
PERIOD OF RECORD.--April 1927 to current year. Records for February 1925 to September 1926, published in WSP 601 and 621, are unreliable and should not be used.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2007.
REGULATION.--Some small diurnal fluctuation at low flow caused by mills upstream. Discharge includes discharges at treatment plants upstream, much of which is diverted from another drainage basin for industrial and municipal supply. Wastwater treatment upstream estimated input 6.4 cfs.
GAGE OPERATION.--Virginia Department of Environmental Quality - Water Division.
     Duration Plot with 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 01625000 plot. MIDDLE RIVER NEAR GROTTOES, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 08/27/2008 is 67.57 cubic feet per second.

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


                01625000     MIDDLE RIVER NEAR GROTTOES, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
50.4
81.2
91.9
168
290
480
773
992
2,630
 
80
February
47.8
94.6
121
216
364
597
841
1,040
2,870
 
80
March
47.4
141
176
275
450
692
1,030
1,490
3,050
 
80
April
91.1
138
170
249
380
668
980
1,170
2,780
 
80
May
74.6
116
143
192
290
432
653
897
1,790
 
80
June
40.4
87.1
103
149
211
308
493
713
1,880
 
80
July
30.4
65.4
77.8
110
156
210
301
437
1,990
 
80
August
26.4
58.6
68.9
99.4
131
195
359
515
1,900
 
80
September
23.1
59.7
68.1
86.5
117
187
423
654
3,590
 
80
October
41.5
62.9
71.0
88.4
115
207
547
865
2,210
 
79
November
53.5
67.4
79.1
96.9
138
276
477
614
3,550
 
80
December
47.5
72.0
84.4
110
217
347
612
818
1,700
 
80
 
       

The current 14-day running-average value for 08/27/2008 is 67.57 cubic feet per second.

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

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