About: http://webisa.webdatacommons.org/104399150

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	Most systems take advantage of gravity, meaning that flow runs through piping and distribution boxes without the assistance of any mechanical device such as a pump.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es