Quote Originally Posted by Redrobes View Post
2. Rivers originally start with water which has fallen from rain.
A river can also be the result of melt water from mountain snowpacks. In fact that is where most of the water comes from where I live (central oregon). When you have a river like this you get high and low points. The highest points usually come during spring and early summer when the snowpack starts melting. Late summer and into fall it tapers off, getting to its lowest in the winter. Winter replenishes the snowpack and the cycle starts over again.

Good look at how rivers form though, very helpful (have some rep).