Methods for estimating selected low-flow frequency statistics and harmonic mean flows for streams in Iowa

Eash, David A.; Barnes, Kimberlee K.

doi:10.3133/sir20125171

Cited by 13 publications

(68 citation statements)

References 8 publications

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“…Brief descriptions of the first three reports are presented in the fourth report (Eash and Barnes, 2012).…”

Section: Purpose and Scopementioning

confidence: 99%

“…A map of soil regions in Iowa is presented in Eash and Barnes (2012) and a detailed description of soils in Iowa is presented by Oschwald and others (1965). A brief description of landform regions in Iowa is presented in Eash and Barnes (2012) and a detailed description is presented by Prior (1991). Updates to landform regions in Iowa are described in Prior and others (2009).…”

Section: Description Of Study Areamentioning

confidence: 99%

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Methods for estimating selected spring and fall low-flow frequency statistics for ungaged stream sites in Iowa, based on data through June 2014

Eash¹,

Barnes²,

O'Shea³

2016

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Graphs showing relation between the spring 7-day mean low-flow for a recurrence interval of 10 years discharges computed from observed streamflow and those predicted from regression equations for low-flow regions in Iowa for northeast region, northwest region, and southern region, showing streamgages by map number with some of the largest differences between predicted and observed discharges . AbstractA statewide study was led to develop regression equations for estimating three selected spring and three selected fall low-flow frequency statistics for ungaged stream sites in Iowa. The estimation equations developed for the six low-flow frequency statistics include spring (April through June) 1-, 7-, and 30-day mean low flows for a recurrence interval of 10 years and fall (October through December) 1-, 7-, and 30-day mean low flows for a recurrence interval of 10 years. Estimates of the three selected spring statistics are provided for 241 U.S. Geological Survey continuousrecord streamgages, and estimates of the three selected fall statistics are provided for 238 of these streamgages, using data through June 2014. Because only 9 years of fall streamflow record were available, three streamgages included in the development of the spring regression equations were not included in the development of the fall regression equations. Because of regulation, diversion, or urbanization, 30 of the 241 streamgages were not included in the development of the regression equations. The study area includes Iowa and adjacent areas within 50 miles of the Iowa border. Because trend analyses indicated statistically significant positive trends when considering the period of record for most of the streamgages, the longest, most recent period of record without a significant trend was determined for each streamgage for use in the study. Geographic information system software was used to measure 63 selected basin characteristics for each of the 211streamgages used to develop the regional regression equations. The study area was divided into three low-flow regions that were defined in a previous study for the development of regional regression equations.Because several streamgages included in the development of regional regression equations have estimates of zero flow calculated from observed streamflow for selected spring and fall low-flow frequency statistics, the final eq...

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“…Brief descriptions of the first three reports are presented in the fourth report (Eash and Barnes, 2012).…”

Section: Purpose and Scopementioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Methods for estimating selected spring and fall low-flow frequency statistics for ungaged stream sites in Iowa, based on data through June 2014

Eash¹,

Barnes²,

O'Shea³

2016

Scientific Investigations Report

Self Cite

View full text Add to dashboard Cite

show abstract

“…None of the QAH values were zero, so logistic-regression equations were not developed for QAH. Procedures and assumptions of logistic regression are described in detail elsewhere (Tasker, 1989;Ludwig and Tasker, 1993;SAS Institute, Inc., 1995;Allison, 1999;Hosmer and Lemeshow, 2000;Helsel and Hirsch, 2002;Hortness, 2006;Bent andSteeves, 2006, Eash andBarnes, 2012). Explanatory variables tested in the logistic regressions included numerous physical and climatic characteristics of each gaged basin (table 2).…”

Section: Logistic-regression Analysismentioning

confidence: 99%

“…Methods to estimate regression-equation prediction errors are outlined in the following equations and tables (Tasker and Driver, 1988;Ludwig and Tasker, 1993;Ries and Dillow, 2006;Stuckey, 2006;Gotvald and others, 2009;Eash and Barnes, 2012). The 90-percent prediction interval for the true but unknown value of a flow statistic for an ungaged site is…”

Section: Prediction Intervalsmentioning

confidence: 99%

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Estimating selected low-flow frequency statistics and harmonic-mean flows for ungaged, unregulated streams in Indiana

Martin¹,

Fowler²,

Arihood³

2016

Scientific Investigations Report

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Independent variable selection for regression modeling of the flow duration curve for ungauged basins in the United States

Fouad

Loáiciga

2020

Journal of Hydrology

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Methods for estimating selected low-flow frequency statistics and harmonic mean flows for streams in Iowa

Cited by 13 publications

References 8 publications

Methods for estimating selected spring and fall low-flow frequency statistics for ungaged stream sites in Iowa, based on data through June 2014

Methods for estimating selected spring and fall low-flow frequency statistics for ungaged stream sites in Iowa, based on data through June 2014

Estimating selected low-flow frequency statistics and harmonic-mean flows for ungaged, unregulated streams in Indiana

Independent variable selection for regression modeling of the flow duration curve for ungauged basins in the United States

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