Surface runoff (also known as overland flow) is the flow of water that occurs when excess stormwater, meltwater, or other sources flows over the earth's surface.this might occur because soil is saturated to full capacity, because rain arrives more quickly than soil can absorb it, or because impervious areas (roofs and pavement) send their runoff to surrounding soil that cannot absorb all of it.. Water balance model. welcome to model my watershed - runoff simulation. see how changes in the amount of rainfall, the surfaces on which the rain falls and the texture of the soil change where the water goes.. Stormwater runoff is the number one cause of stream impairment in urban areas. where rain falls on paved surfaces, a much greater amount of runoff is generated compared to runoff from the same storm falling over a forested area. these large volumes of water are swiftly carried to our local streams, lakes, [�].
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