This study presents analysis methodology and results of characterizing the spatial and temporal distribution of rainfall used for design purposes by the Nevada Department of Transportation (NDOT). An assumption of uniform rainfall over watersheds can lead to unreasonably large peak flow rates, especially in regions where rainfall is highly variable or isolated in areal extent. Analysis of actual storm events in terms of temporal and spatial distributions is expected to be more representative of rainfall experienced in Nevada, thus making design of drainage infrastructure more efficient.
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