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.. S = potential maximum watershed water retention after runoff begins (inch). t c = time of concentration for the watershed (hr); time for runoff to travel from the furthest distance (by time) in the watershed to the location where you wish to determine q p..
Surface runoff is water, from rain, snowmelt, or other sources, that flows over the land surface, and is a major component of the water cycle. runoff that occurs on surfaces before reaching a. 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, […]. The rational method equation. the equation that is the centerpiece of the rational method is: q = cia, where q is the peak surface runoff rate in cfs, from a watershed of area, a acres, and runoff coefficient, c, due to a storm of intensity, i in/hr..
