Streamflow, or channel runoff, is the flow of water in streams, rivers, and other channels, and is a major element of the water cycle. The record of flow over time is called a hydrograph. The way msfs terrain look as we see is because of water flowing over the terrains; this scenery add those water features that have shaped terrains all around the world. These are visible mostly everywhere you fly; they reflect sun light and they are also visible on aircrafts terrain maps. Uk and Ireland Wateflow add 153394 water features connecting lakes; rivers trough small to medium size streams. No impact on frame rates. Coverage: Uk and Ireland.