Forests are moderators, they absorb water excess in rainy days, reducing floods. Also, trees reales the water slowly to rivers, so that in drought seasons they provide water. Forest maintain the soil humid, so organic material is always there because of that, and this organic material feeds trees and decomposing organisms.
So all this will be affected with the forest cut down.
Thus when the positive side on one water molecule comes near the negative side of another water molecule, they attract each other and form a bond. This "bipolar" nature of water molecules gives water its cohesive nature, and thus, its stickiness and culpability
