Το βρετανικο "Sewers for Adoption" γραφει τα εξης σχετικα με την επικαλυψη σωληνων αποχ/σης (λυματων και ομβριων):
Minimum depths of cover to the crown of pipes without protection should be as follows:
a) domestic gardens and pathways without any possibility of vehicular access – 0.35 m;
domestic driveways, parking areas and yards with restrictions to prevent entry by HGV’s – 0.5 m;
c) domestic driveways, parking areas and narrow streets without footways (e.g. mews developments) with limited access for HGVs - 0.9 m;
d) agricultural land and public open space - 0.9 m;
e) other highways and parking areas with unrestricted access for HGVs - 1.2 m.
