ABSTRACT
Rubber tree (Hevea brasiliensis) originally found in the Amazon rainforest has been exploited since
watershed in the region of Khon Kaen has been selected to monitor the different components of the water balance along a toposequence. A special focus will be put on the evolution of the groundwater level, in order to test the possibility to draw it down to its original depth. Time necessary to measure actual changes in the water balance is generally long, therefore numerical simulation will be used to quantify and forecast these processes and test alternative situations.
