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Comparative Analysis of IDF Curves at Selected Sites in Utah
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2005-01-01
[PDF-3.07 MB]
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Abstract:This study consists of two parts. Section 1 deals with analyzing the magnitude of orographic effect on IDF curves in four strategic regions in Utah. For the Wasatch North Region the precipitation is statistically different at the 90% confidence level for over three quarters of the data points. As might be expected, in all of these cases the leeward precipitation was less than the windward precipitation. The amount of the difference ranged from about 25% to 50%. For the other three regions, the precipitation was statistically different at the 90% confidence level for fewer than 15% of the data points. In general, in cases where there were significant differences, the leeward precipitation was less than the windward precipitation. The second part of this study is presented in Section 2, and it deals with the comparison of IDF curves from two different sources. In general, the NOAA (new) precipitation estimates were less than the UCC (old) precipitation estimates for return periods of 50 years or less. The amounts of the differences ranged from about 5% to 33%. Hydraulic structure designs based on the UCC estimates with return periods of 50 years or less are most likely more conservative than those based on NOAA curves.
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