RATING Classification Definition Probable works
0Excellent No slope defects.
1Good Some surface instability with minor falls. No ongoing movement. No maintenance needed.
2Fair Minor slips in face. Surface instability, with falls that encroach onto pavement or block drains.
Open cracking or and loosening of minor blocks.
Blocked surface or ground drains. Minor seepage. No ongoing movement.
Clear debris, minor maintenance or repairs.
3Poor Slip affecting part of face
Many falls onto pavement.
Cracking and loosening of blocks.
Water leakage or standing water.
Ongoing movement unlikely.
Some slope stabilisation necessary.
4Very Poor Face slip and threatening property.
Major blocks at risk of falling.
Drainage system not functioning, leakage down face.
Possible ongoing movement.
Major stabilisation or retaining wall needed.
5Critical Major landslide affecting pavement.
Probable ongoing movement.
Retaining wall or major slope stabilisation.