Statistical summaries of selected Iowa streamflow data through September 2013.
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2015-01-01
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Alternative Title:Open-File Report 2015-1214
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Abstract:Statistical summaries of streamflow data collected at
184 streamgages in Iowa are presented in this report. All
streamgages included for analysis have at least 10 years of
continuous record collected before or through September
2013. This report is an update to two previously published
reports that presented statistical summaries of selected Iowa
streamflow data through September 1988 and September
1996. The statistical summaries include (1) monthly and
annual flow durations, (2) annual exceedance probabilities of
instantaneous peak discharges (flood frequencies), (3) annual
exceedance probabilities of high discharges, and (4) annual
nonexceedance probabilities of low discharges and seasonal
low discharges. Also presented for each streamgage are graphs
of the annual mean discharges, mean annual mean discharges,
50-percent annual flow-duration discharges (median flows),
harmonic mean flows, mean daily mean discharges, and
flow-duration curves. Two sets of statistical summaries are
presented for each streamgage, which include (1) long-term
statistics for the entire period of streamflow record and
(2) recent-term statistics for or during the 30-year period of
record from 1984 to 2013. The recent-term statistics are only
calculated for streamgages with streamflow records pre-dating
the 1984 water year and with at least 10 years of record during
1984–2013. The streamflow statistics in this report are
not adjusted for the effects of water use; although some of
this water is used consumptively, most of it is returned to
the streams.
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