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    What is the difference between them all? Also, what is it called when water flows underground?

    Thank you
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    Surface runoff (or overland flow) is the flow of water across the land surface, usually in a shallow unchannelled sheet.

    Through flow is the downslope movement of water through the soil, roughly parallel to the ground surface.

    Groundwater flow is the very slow horizontal movement of water through rock.

    So basically surface run off is the flow of water over the surface, through flow is the flow of water through the soil, and groundwater flow is the flow of water through the rock
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    You might encounter 'pipeflow' as well. This is just water moving through holes that have been eroded into the rock. This can due to the carbonation of limestone for example.
 
 
 
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