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Updating Rainfall Zones and Intensities in Nebraska for Improved Design of Non-bridge-sized Drainage Structures
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2025-01-01
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[PDF-9.01 MB]
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Edition:Final Report: July 2022 – May, 2024
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Abstract:This study assesses the effectiveness of precipitation zones and Intensity-Duration-Frequency (IDF) curves used by the Nebraska Department of Transportation (NDOT) for designing drainage structures. Twenty stations were selected for the analysis of revised IDF curves out of forty-two stations. Datasets have been considered from the National Center for Environmental Information (NCEI). By Comparing the new curves with existing ones, the study efforts examine the frequency, duration and severe rainfall. The results show that the IDF curves for various zones and stations varied noticeably from one another. Also, noticed that Zone A and B shows lower rainfall intensities in short to medium duration. While, Zone C shows higher rainfall intensities short to medium duration. The variation can be seen by a verification using ATLAS-14 IDF curves and historical data, suggesting the necessity for an updated methodology. Additionally, this study used the Kriging and Inverse Distance Weighting (IDW) approach to analyze rainfall spatially. The study employed the k-means clustering technique to identify if the new cluster was considered to be a rainfall zone. The studies show the development of three spatial zones and a new IDF is created based on this clustering analysis. The research being conducted provides crucial information to ensure the sustainability of the Nebraska transportation system and increase the accuracy of hydrological assessments.
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