Surface Runoff

Surface runoff is the unconfined flow of water over the ground surface, in contrast to channel runoff. It occurs when excess rainwater, stormwater, meltwater, or other sources, can no longer sufficiently rapidly infiltrate into the soil. This can occur when the soil is saturated by water to its full capacity, and the rain arrives more quickly than the soil can absorb it.

Surface runoff often occurs because impervious areas do not allow water to soak into the ground.
Furthermore, runoff can occur either through natural or human-made processes.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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