Some human activities that affect watersheds is Building dams and rerouting rivers are two examples of ways humans directly impact water in watersheds. Humans also use water as a resource, drawing from watersheds for our drinking water. This does not have to be a negative impact, as water usage can be monitored so that it is sustainable. Then on the other hand the natural factors the affect the health of a watershed is the quality and quantity of water in streams, rivers or lakes are dependent on its watershed. Another thing is The physical characteristics of a watershed, including geology, soil types, vegetation, topography and slope, also influence water- shed water quality. creek, stream or river to determine aquatic health.
I hope this helps.
