GEOGUIDE 1 GUIDE TO RETAINING WALL ... - HKU Libraries

160Table 25 - Suggested Frequencies of Routine and Engineer Inspectionsfor Retaining WallsType of InspectionInspection Frequencies forDifferent Risk Categories (1)High to LowNegligibleRoutine inspectionYearly, preferablybefore wet seasonEvery five yearsEngineer inspectionEvery five yearsNotes :_______(1) The risk categories are those defined in the Geo technical Manual forSlopes (GCO, 1984). Where the land use is changed, the adequacy ofthe maintenance and monitoring requirements should be reviewed,(2) The inspection frequencies are for general guidance only. Accountshould be taken of the age and condition of the wall and the particularmonitoring requirement. More frequent inspections should be carriedout when there have been adverse environmental changes or when signsof distress have been observed. Immediate actions and follow-upactions are required in emergency situations.