The United States Geological Survey (USGS) daily streamflow dataset is the source of this dataset. Streamflow data are subjected to human interference, and therefore data contain both natural and regulated flows. This practice does not cause serious problems in flood frequency analysis (flows are much larger), but it is expected to result in more errors for low flow (drought) conditions. Therefore, only unregulated stations were included to ensure an unbiased analysis. After imposing the 50-year record length requirement, a total of 36 unregulated stations were available for the study area. The stations vary in their start and end dates with the earliest start date at 1923 and the latest end date at 2007. Most start dates are in the 1940s and most end dates are 2006 or 2007. Daily mean flow data were collected and processed to form monthly mean discharges.
Data are available in two formats: as text documents (input files), or as plots which can be downloaded as a
png, jpeg, pdf or svg vector image file. The data format of the input files is: Station name, Latitude (Decimal degrees NAD27), Longitude (Decimal degrees NAD27), Gauge Datum (in feet above the sea level NGVD29), UTMX, UTMY, Type of Station (Regulated - O, Unregulated - X), HUC Number, Data (Arranged Month-wise
Jan-Dec). Missing data points for any month is given a value of -99. Plots utilize "Yearly Average" streamflow in cubic feet per second as the y-axis, and "Date" (year) as the x-axis.
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