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Spatial patterns of anomalous runoff to precipitation ratios for watersheds within the contiguous United States arranged by level one ecoregions Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/8336h261b

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  • Mean annual runoff to precipitation (R/P) ratios were generated for 966 watersheds within the contiguous United States. The watersheds were plotted using Arc View GIS and used as part of an overlay analysis with Level 1 U.S. ecoregions. The ratios were statistically evaluated to determine anomalous R/P conditions within the ecoregions. Anomalous conditions are defined as any watershed that has a mean R/P greater than two standard deviations from the mean R/P for the ecoregion in which it lies. The highest mean R/P ratios were found to correlate positively with regions that are characterized by significant topographic relief. Anomalous R/P conditions were consistently found in the higher elevations of each ecoregion. This may indicate that precipitation volume may play a greater role in governing the R/P ratio for a region than it's evapotranspiration regime.
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