About: http://webisa.webdatacommons.org/421350262

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	One of the essential features of a proper collecting pipe or conduit for this system is a wall that is impervious where it passes through any ofiending stratum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca