Assertion: spring's water | /r/CapableOf | encounter low permeability zone
Facets:
Source sentences:
text: The existence of a spring requires that below the surface (the area commonly called the subsurface), the infiltrating water encounters a low permeability zone and is unable to continue to move downward as fast as it is supplied at the surface; as a result, the water spreads laterally until it intersects the land surface where erosion has lowered the topography to the water's level (e.g., on the side of a canyon).