Streams may start with runoff or water seeping out of a spring.
Ground water and streams reduced replenishment of ground water also affects streams.
Water will runoff as springs to replenish ground water.
water will runoff as springs to replenish what
  * kinetic energy
  * rocks
  * hills
  * ground water
  * Sediment
  * an organism's body
  * erosion
  * solid, liquid, gas