A water shed is like the land, the people, the creeks, lakes, ground water,etc. Basically it is anything that contributes to the water-cycle in your area.
The Black Rocky watershed is located in our area of north east Ohio. We get our drinking water from the lake so we must keep the keep overall pollution low to keep our water clean.
The flint water crisis all started because the city of Flint did put anti corrosion solution into the water pipes this lead to the pipes being damaged. (No Pun intended). Ultimately over time lead got into the water and people started getting very ill. Finally they tested the water and found lead and now the people can't use their running water. This all would never happened if the city wouldn't of changed their supply of water to the Flint River because they have contaminated their watershed.