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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of Daily Streamflow
 
02055000 ROANOKE RIVER AT ROANOKE, VA
LOCATION.--Latitude 3715'30", Longitude 7956'20", North American Datum of 1927,
                    Roanoke City, VA, Hydrologic Unit 03010101.
DRAINAGE AREA.--384 square miles.
PERIOD OF RECORD.--February 1899 to current year. Monthly discharge only for some periods, published in WSP 1303. Records for July 1896 to January 1899 published in WSP 11, 15, 27, and 20th Annual Report, Part 4, are unreliable, due to doubtful gage-height record, and should not be used.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--Prior to 1949, diurnal fluctuation caused by powerplants. After 1994, withdrawal of 11.1 cfs.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.

     Duration Plot with Daily Streamflow Conditions
Provisional Data Subject to Revision
02055000 plot. 
ROANOKE RIVER AT ROANOKE, VA
Provisional Data Subject to Revision

                    

The current daily value for 03/22/2017 is 209.0 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


                02055000     ROANOKE RIVER AT ROANOKE, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
30.0
75.0
96.1
174
294
537
895
1,260
9,820
 
115
February
27.0
102
130
230
376
620
1,050
1,510
11,100
 
117
March
54.0
141
182
290
460
734
1,260
1,910
9,200
 
117
April
74.0
157
183
256
376
623
1,040
1,540
13,800
 
117
May
60.0
116
140
191
280
431
754
1,150
13,600
 
117
June
43.0
76.0
90.1
126
184
301
566
855
15,900
 
117
July
29.0
55.0
67.0
93.0
135
218
400
611
12,700
 
117
August
18.0
43.0
55.0
77.0
114
184
360
536
18,200
 
117
September
16.0
45.0
52.0
69.0
98.0
156
328
573
12,900
 
117
October
30.0
50.0
56.6
76.0
108
184
377
688
10,200
 
115
November
38.0
60.0
68.0
89.0
132
240
460
674
15,000
 
115
December
35.0
65.0
78.0
112
205
360
680
1,040
13,600
 
115
 
       
Instantaneous minimum flow for period of record = 0.00 cubic feet per second.
Flow values of 0.00 are plotted as 0.01

The current daily value for 03/22/2017 is 209.0 cubic feet per second.

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

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