There was less erosion because the wolves helped regenerate trees and the trees roots sucured the land in place which then made the water move less and stay in place.
A watershed is all of the land that drains water into the same location or body of water such as a lake, river, or creek.
The Water Cycle is made up of many diffrent parts and each part is essential to how it works if you were to take away one part such as evaporation the hole thing would fall apart.
Watersheds helped cause the water crises because the runoff from watersheds were to acidic and carodid pipes. The lead from the pipes then went in to the water and posiand people.