Catchment located within the houay pano main catchment, Ban Lak Sib, km 10 from Luang Prabang, Lao PDR. The study will be conducted in a typical montane watershed of SEA (houay pano 19 ํ51’ 10 ‘’N 102 ํ10’45’’E) observatory monitored since 1998 (menagement of soil Erosion Consortium ) (MSEC)). This observatory is representative of the widespread morpho-climatic conditions that prevail in the region (i.e. steep slopes and intense rainfall), and is undergoing a land use transition that is common throughout the tropics ,thus clearly allowing to draw conclusions reaching far beyond the immediate context of the site.