It is very true. These trees just suck up water and wherever it (water) disappears to we do not know.
At our place,we had swampy invested with water reeds and the likes in the 80's. When grazing cows in those days and if they stray there,u just pray they do not drown,you just go home and wait for the cows to come by themselves home. if u makea mistake to follow the cows in the swamp,you could disappear in it. Bit by bit,the eucalyptus was planted in these areas. As they grew in length,the soil got drier season by season. Siku hizi,place is dry! Environmental hazard those trees are.