An arrangement for a sewerage system comprising a french drain

An arrangement (100) for a sewerage system comprising a French drain comprising an inspection well device (102) suitable to be connected between a first drain system and a French drain system for enabling installation of said French drain at least partly under of said first drain, so that said first drain systems and said French drain system remain as separate systems, wherein said inspection well device (102) comprises

• a bottom part (104) for preventing unwanted water and dirties from entering into said French drain, wherein
• said inspection well device further comprises a tube part (106) protruding from said bottom part (104) for inspecting and cleaning said French drain, and
• the height of the tube part (106) is selected to be higher than any outlets (114) for pipelines in said first drain.