It could over flow because the plants took in the water so the river is use to having a certain amount and since the plants aren't there any more to suck up the water, the level rises and goes over the edge
It affects the river flow, because since all of those trees are cut down, <span>there's nothing to hold the soil in place. And then, because of that, river banks will erode then causing the river to form a different shape. And when the river forms a different shape, it can cause the river pattern to change ~Hope this helped :)</span>
