U.S. Geological Survey
Open-File Report 03-146
Flow Characteristics at U.S. Geological Survey Streamgages in the Conterminous
United States
By David M. Wolock
This dataset represents point locations and flow characteristics for current
(as of November 20, 2001) and historical U.S. Geological Survey (USGS)streamgages
in the conterminous United States. The flow characteristics were computed from
the daily streamflow data recorded at each streamgage for the period of record.
The attributes associated with each streamgage include:
Station number Station name Station latitude (decimal degrees in North American
Datum of 1983, NAD 83) Station longitude (decimal degrees in NAD 83) First data
(year, month, day) of streamflow data Last year (year, month, day) of streamflow
data Number of days of streamflow data Minimum and maximum daily flow for the
period of record (cubic feet per second) Percentiles (1, 5, 20, 25, 50, 75,
80, 90, 95, 99) of daily flow for the period of record (cubic feet per second)
Average and standard deviation of daily flow for the period of record (cubic
feet per second) Mean annual base-flow index (BFI: see supplemental information)
computed for the period of record (fraction, ranging from 0 to 1) Year-to-year
standard deviation of the annual base-flow index computed for the period of
record (fraction) Number of years of data used to compute the base-flow index
(years) Reported drainage area (square miles) Reported contributing drainage
area (square miles) National Water Information System (NWIS)-Web page URL for
streamgage Hydrologic Unit Code (HUC, 8 digit) Hydrologic landscape region (HLR)
River Reach File (RF1) segment identification number (E2RF1##).
Station numbers, names, locations, and drainage areas were acquired through
the National Water Information System (NWIS)-Web () on November 20, 2001. The
streamflow data used to compute flow characteristics were copied from the Water
server (water.usgs.gov:/www/htdocs/nwisweb/data1/discharge/) on November 2,
2001.
The missing value indicator for all attributes is -99. Some streamflow characteristics
are missing for: (1) streamgages measuring flow subject to tidal effects, which
cause flow to reverse directions, (2) streamgages with site information but
no streamflow data at the time the data were retrieved, and (3) streamgages
with record length too short to compute the base-flow index.
David M. Wolock, 2003, Flow characteristics at U.S. Geological Survey
streamgages in the conterminous United States: U.S. Geological Survey Open-File
Report 03-146, digital data set, available on World Wide Web at URL http://water.usgs.gov/lookup/getspatial?qsitesdd
http://water.usgs.gov/lookup/getspatial?qsitesdd
For additional information contact:
David Wolock
U.S. Geological Survey
4821 Quail Crest Place
Lawrence, KS 66049-3839
Telephone: (785) 832-3528
Fax: (785) 832-3500
Email: dwolock@usgs.gov
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