The HEXB'08 (Hydrological EXperiment in Blue Nile) experiment provided an opportunity, via dense network of rain gauges, to study the spatial variability of daily rainfall at a 5 km × 5 km scale in a humid and mountainous part of the Blue Nile river basin, for the period of 2 July–9 August 2008. The results of daily rainfall spatial analyses are shown in this paper. High‐intensity rainfall events have more absolute spatial variability (as measured by standard deviation) and less relative spatial variability (as measured by coefficient of variation), compared to lower intensity events. The coefficient of variation of daily rainfall, computed using gauge‐measured rainfall at several rain gauges, varies from 12% to 424%, with a median of 38% to 51%, indicating that there is a significant variability from one gauge observation to the other at the daily time scale, and one gauge does not represent 5 km × 5 km grid‐average daily values. For rainfall events that had significant contribution to the total rainfall, the coefficient of variation is within 55%.
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Bitew et al. (2009) studied this question.
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