The aim of this study is to know the magnitude of rainfall interception loss in E. pellita plantation forest, at PerawangRiau. In order to obtain the magnitude of interception loss, stemfl ow and throughfall were measured on E. pellita plants at ages of 2 to 6 years with replication of 3 times, respectively. The results showed that the magnitudes of interception loss, throughfall and stemfl ow were 13.3-18.7 %; 7.7-83.1 % and 3.6-4.1 % from rainfall, respectively. The canopy storage capacity was calculated at 0.8 mm. The relationships of rainfall against both throughfall and stemfl ow showed strong correlations with r2 values of 0.99 and 0.79, respectively; while rainfall against interception has moderate correlation with r2 value of 0.58.
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