About: http://webisa.webdatacommons.org/248321192

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	Other surfaces, especially hand laid tarmac, need a steeper gradient than this, say 1:60, to ensure adequate drainage.
http://www.w3.org/ns/prov#wasQuotedFrom	pavingexpert.com