35 percent of precipitation fall on land becomes runoff.
When there is more water present than the land can absorb, runoff occurs. The extra liquid drains into surrounding creeks, streams, or ponds after flowing across the land's surface. Both natural processes and human activity can produce runoff. Snowmelt is the most well-known kind of natural runoff. Heavy snowfalls that mountains cannot absorb result in runoff that eventually forms streams, rivers, and lakes. Rain, snow, and glaciers all play a part in this organic discharge. Runoff also occurs naturally as soil is eroded and carried to various bodies of water.
Even toxic chemicals enter waterways through natural processes, such as volcanic eruptions. Toxic gases released by volcanoes eventually return to the water or soil as precipitation.
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