The cause of the groundwater leakage in the concrete approach ramps should ideally have been eliminated so that repairs are not required. Nowadays it’s easy to find an experienced specialist plumber online who will be able to quickly identify the issue, cctv drain survey hythe using the latest tree root mapping systems and tools (some even use ground penetrating radar to detect issues). New concrete inverts were provided in the ramps (Wilde and Craft, 2015), but these required groundwater pressure…