“…RF is characterized by the capability of handling high‐dimensional problems with good accuracy and reliability, a few parameters to be adjusted, insensitivity to noise due to its special sampling and decision‐making mechanism, and the exemption of over‐fitting, leading to its suitability for online condition assessment. RF‐based approaches are increasingly popular for structural condition assessment 42–50 . Some of them focus on deterioration modeling and forecasting of sewer pipelines, 44–46 and in these investigations the input features are the suggested physical sewer characteristics (e.g., age, material, type of effluent, depth, diameter, slope, and type of road) and the output is deterioration level (e.g., four‐grade scale: C1–C4) obtained by using CCTV or GIS records.…”