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A general research subject in rainfall runoff modeling is assessment of space time variability in event time series. A MATLAB program is developed for taking account of the space and time distribution. We focus on central Tunisia (Merguellil and Skhira basin), where rainfall is known by its high variability for over a decade. We introduce a variability matrix on a geomorphology-based transfer function. Robustness of the developed program is checked for some real events from the Skhira basin data. Its potential is especially interesting in data-sparse regions where the geomorphology-based approach can be applied in a vigorous and adjustable way, and where the accounting of rainfall space and time variability is much supple.