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Comparisons of estimates of annual exceedance-probability discharges for small drainage basins in Iowa, based on data through water year 2013 : [summary].
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  • Abstract:
    Traditionally, the Iowa DOT has used the Iowa Runoff Chart and single-variable regional regression equations (RREs) from a USGS report

    (published in 1987) as the primary methods to estimate annual exceedance-probability discharge

    (AEPD) for small (20 mi2

    or less) drainage basins in Iowa. With the publication of new multi- and

    single-variable RREs by the USGS (published in 2013), Iowa DOT needs to determine which

    methods of AEPD estimation provide the best accuracy and the least bias for small drainage

    basins in Iowa. In response to this need, the USGS, in cooperation with the Iowa DOT and the

    Iowa Highway Research Board, initiated a statewide study in 2014 to compare and evaluate AEPD

    estimates from five different AEPD-estimation methods.

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