# Noah, Joseph, and Operational Hydrology

@article{Mandelbrot1968NoahJA, title={Noah, Joseph, and Operational Hydrology}, author={Benoit B. Mandelbrot and James R. Wallis}, journal={Water Resources Research}, year={1968}, volume={4}, pages={909-918} }

By ‘Noah Effect’ we designate the observation that extreme precipitation can be very extreme indeed, and by ‘Joseph Effect’ the finding that a long period of unusual (high or low) precipitation can be extremely long. Current models of statistical hydrology cannot account for either effect and must be superseded. As a replacement, ‘self-similar’ models appear very promising. They account particularly well for the remarkable empirical observations of Harold Edwin Hurst. The present paper…

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