Runoff

Science / Geology / Runoff: Liquid water moving over the land surface as a sheet or channelized flow. The portion of precipitation that moves over the ground instead of evaporating or infiltrating.

Direct Runoff

Business / Agriculture / Direct Runoff: Water that flows over the ground surface or through the ground directly into streams, rivers, and lakes. Runoff is the cause of rill erosion and a source of nonpoint pollution. MORE

Surface Runoff

Business / Agriculture / Surface Runoff: Precipitation, snow melt, or irrigation water in excess of what can infiltrate the soil surface and be stored in small surface depressions: a major cause of erosion and transporter of nonpoint source MORE

Hydrologic Cycle

Science / Geology / Hydrologic Cycle: The natural cycling of Earth's water between the atmosphere, surface and subsurface through the processes of evaporation, transpiration, percolation, infiltration, runoff and precipitation. MORE

Drainage Divide

Science / Geology / Drainage Divide: The boundary between two adjacent drainage basins. Drainage divides are ridge crests (or less obvious locations where slope of the landscape changes direction). Runoff produced on one side of the ridg MORE

Intermittent Stream

Science / Geology / Intermittent Stream: A stream that goes dry at certain times of the year. Intermittent streams flow during seasons of the year when runoff and/or ground water contributions sustain the flow of the stream. They stop flowin MORE

Non-Point Source Pollution

Science / Geology / Non-Point Source Pollution: Pollution that does not originate at a single location. In an urban area runoff water can be polluted as it flows to a stream by gasoline, antifreeze, road salt or other contaminants. In rural areas r MORE

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