Small watershed storm runoff in the southwestern United States is dominated by intense, short-duration convective rains of limited areal extent. Most commonly, flood peak estimates are based on rainfall predictions found in the National Oceanic and Atmospheric Administration (NOAA) Atlas 2, a precipitation-frequency atlas for the Western United States. Records of short-duration rainfall (5 to 30 min. duration) from a dense network of recording rain gauges in southeastern Arizona indicate that flood peaks based on NOAA Atlas 2 for less frequent events (50-yr. and 100-yr. frequencies) for small watersheds are underestimated.
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Osborn et al. (1988) studied this question.
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