StructuralPhysical adequacy to support imposed loads. Performance GradeThe elevations shown on plans and/or survey grade stakes for the installation of the carrier pipe. It is occasionally to give elevations for casing. In most cases, it is given to the flow line but can also be given to the top of the pipe or casing.; used to generate a final structural condition classification for sewer lengths. Recognizes the impact of external factors: surrounding soil conditions; frequency of surcharging, for example, and relates these to the Internal Condition Grade (ICGInternal Condition Grade; numeric criteria applied to visual images of sewers to develop a priority rating based on defects observed.).
