Called to a housing development in Northamptonshire to investigate and clear a drainage manhole that had become completely obstructed. During construction activity a significant quantity of concrete and construction material had entered the drainage system, accumulating within the manhole and drainage channel and restricting the pipework to the point the system could no longer function correctly. Inspection identified a substantial build-up of hardened concrete, sediment and construction debris around the drainage channel and pipe connections. Because of the quantity and position of the material, conventional drain jetting alone wasn't suitable — access into the chamber was required to tackle the blockage directly. The RCH Drainage team carried out controlled man-entry works to access the affected area. The concrete and compacted material were progressively broken down and physically removed from around the drainage channel and pipework, exposing and clearing the affected drainage route.