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Zanardo, S. (author), Harman, C.J. (author), Troch, P.A. (author), Rao, P.S.C. (author), Sivapalan, M. (author)We evaluate the extent to which within-year rainfall variability controls interannual variability of catchment water balance. To this end, we analytically derive the probability density function of the annual Budyko evaporation index, B (i.e., the ratio of annual actual evapotranspiration to annual precipitation), by accounting for the...journal article 2012