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In order to estimate the rainfall fields over an entire basin raingauge, pointwise measurements need to be interpolated and the small-scale variability of rainfall fields can lead to biases in the rain rate estimation over an entire basin, above all for small or medium size mountainous and urban catchments. <P style='line-height: 20px;'> For these reasons, several raingauges should be installed in different places in order to determine the spatial rainfall distribution during the evolution of the natural phenomena over the selected area. <P style='line-height: 20px;'> In technical applications, many empirical relations are used in order to deduce heavy areal rainfall, when just one raingauge is available. <P style='line-height: 20px;'> In this work, we studied the areal reduction factor (ARF) using radar reflectivity maps collected with the Polar 55C, a C-band Doppler dual polarized coherent weather radar with polarization agility and with a 0.9&deg; beamwidth. <P style='line-height: 20px;'> The radar rainfall estimates, for an area of 1 km², were integrated for heavy rainfall with an upscaling process, until we had rainfall estimate for an area of 900 km². <P style='line-height: 20px;'> The results obtained for a significant amount of data by using this technique are compared with the most important relations of the areal reduction factor reported in the literature.