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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 7-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 7-Day Average Streamflow Conditions
Provisional Data Subject to Revision 01625000 plot. MIDDLE RIVER NEAR GROTTOES, VA
Provisional Data Subject to Revision

                    

The current 7-day running-average value for 08/27/2008 is 55.57 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


                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
45.1
79.1
92.7
167
271
494
833
1,100
3,690
 
80
February
47.0
95.0
119
207
342
574
860
1,140
3,070
 
80
March
46.1
139
169
266
419
694
1,100
1,470
5,040
 
80
April
89.3
132
163
228
339
580
996
1,270
3,830
 
80
May
71.0
112
133
181
272
409
637
845
2,380
 
80
June
34.3
81.8
97.1
137
192
283
463
721
3,170
 
80
July
25.3
62.7
75.7
106
150
202
299
425
1,860
 
80
August
24.9
57.1
67.4
94.6
125
185
330
554
3,320
 
80
September
20.1
57.4
66.4
85.1
112
170
383
720
6,180
 
80
October
35.9
63.3
70.1
87.7
114
203
463
894
3,730
 
79
November
44.6
66.9
78.0
96.7
138
256
492
651
6,380
 
80
December
42.7
72.3
82.9
110
210
350
623
879
2,680
 
80
 
       

The current 7-day running-average value for 08/27/2008 is 55.57 cubic feet per second.

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

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