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surf mat
surf rock
surf scoter
surface
surface-active
surface lift
surface mail
surface noise
surface runoff
surface structure
surface tension
surface-to-air
surface-to-surface
surfactant
surfari
surfbird
surfboard
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surface runoff
sur·face run·off


noun 
Definition:
 
flow of surplus rainwater over ground: the flow of water over the surface of the ground occurring when rainfall is not absorbed into the soil or evaporated
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