About: http://webisa.webdatacommons.org/299371083

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	ed grade. [3] Openings may be equipped with louvers, valves, screens or other coverings or devices, provided they permit the automatic entry and exit of floodwaters.
http://www.w3.org/ns/prov#wasQuotedFrom	resource.org