Answer: Paragraph in the explanation! (Sorry if this isn't quite what your looking for! ^^")
Step-by-step explanation:
The impact of a river drying up would effect many individual ecosystems and environments. All the water in a flowing river generates from precipitation, so if it dries up, the amount of water formerly in the river can slowly impact all the water in the world. Though it is just one river that originally dried up, as many other dry up, it builds up and eventually causes irreversible damage to the world as a whole.