Water School

  Runoff is the portion of precipitation that doesn’t soak into soil and instead moves from land to streams or other surface water. Runoff can be caused by precipitation, snowmelt and irrigation that the Earth does not soak up. There are three types of runoffs. They include:•    Surface Runoff: Water after precipitation merges with streams or surface water•    Subsurface Runoff: Water soaks into the soil and merges into the water table, the...

Non-point source pollution are harmful substances that occur as a result of human activities over a wide area rather than from one specific location. These include forms of diffuse pollution caused by sediment, nutrients, organic and toxic substances that wash off city streets, plowed fields or other developed areas. The pollution is carried to lakes and streams by runoff.  Examples of non-point source pollution are oil and gas that leak from cars and trucks onto the pavement or over a...