As far as the above ground external drainage system (external drainage system) is concerned, they are generally built in congested, confined space such as enclosed light well or re-entrant of buildings, very often with limited accessibility and visibility.
Officers or appointed consultants sometimes need to conduct inspections from afar on street level, roof or common areas from adjacent buildings. It is not only time consuming but the photos taken are also often distorted with tilted angles or blocked by obstacles.
In some occasions, the drainage defects are identified upon the erection of scaffolding only. In order to enhance the efficiency of default works for external drainage system, the department is now seeking I&T companies to conduct inspecting the external drainage system by UAS or robotic devices with Artificial Intelligence (A.I.) technologies.
