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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of Daily Streamflow
 
01646000 DIFFICULT RUN NEAR GREAT FALLS, VA
LOCATION.--Latitude 3858'33", Longitude 7714'46", North American Datum of 1927,
                    Fairfax County, VA, Hydrologic Unit 02070008.
DRAINAGE AREA.--57.8 square miles.
PERIOD OF RECORD.--October 1934 to current year. Monthly discharge only October to December 1934, published in WSP 1302.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--No known regulation.
GAGE OPERATION.--Virginia Department of Environmental Quality - Water Division.

     Duration Plot with Daily Streamflow Conditions
Provisional Data Subject to Revision
01646000 plot. 
DIFFICULT RUN NEAR GREAT FALLS, VA
Provisional Data Subject to Revision

                    

The current daily value for 02/23/2017 is 19.0 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


                01646000     DIFFICULT RUN NEAR GREAT FALLS, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
9.00
18.0
23.0
32.0
49.0
73.0
122
192
2,100
 
80
February
11.0
25.0
30.0
40.0
53.0
79.0
136
218
1,500
 
80
March
16.0
32.0
36.0
45.0
62.0
88.0
154
262
1,510
 
80
April
20.0
30.0
34.0
43.0
57.0
83.0
128
209
2,530
 
81
May
14.0
22.0
26.0
34.0
48.0
74.0
126
200
2,310
 
81
June
4.30
14.0
17.0
24.0
37.0
53.0
94.9
162
25,000
 
81
July
1.50
6.60
10.0
16.0
26.0
39.0
74.0
129
1,200
 
81
August
0.20
4.50
6.50
11.0
20.0
32.0
65.0
130
2,000
 
81
September
0.10
4.10
5.70
9.80
17.0
28.0
57.0
112
4,860
 
81
October
0.48
6.50
9.10
13.0
20.0
33.0
69.0
130
3,000
 
80
November
5.70
11.0
15.0
20.0
29.0
46.0
83.9
159
2,220
 
80
December
7.20
17.0
21.0
28.0
39.0
60.0
110
195
2,140
 
80
 
       
Instantaneous minimum flow for period of record = 0.05 cubic feet per second.

The current daily value for 02/23/2017 is 19.0 cubic feet per second.

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

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