A manhole (100) for subterranean installation is described. The manhole (100) comprises a first chamber (110) arranged to receive storm water and a second chamber (120) arranged to receive sewage water. The first chamber (110) comprises a first inlet (111) and a first outlet (112). The second chamber (120) comprises a second inlet (121) and a second outlet (122). The first chamber (110) comprises a first access port (113) opposed to a first base (114) and a first wall (115) arranged therebetween. The second chamber (120) comprises a second access port (123) opposed to a second base (124) and a second wall (125) arranged therebetween. A first normal N1 to the first base (114) extends through the first base (114) and the second base (124). A sewer network 1000 and a method of installing the sewer network are also described.

A manhole (100) for subterranean installation is described. The manhole (100) comprises a first chamber (110) arranged to receive storm water and a second chamber (120) arranged to receive sewage water. The first chamber (110) comprises a first inlet (111) and a first outlet (112). The second chamber (120) comprises a second inlet (121) and a second outlet (122). The first chamber (110) comprises a first access port (113) opposed to a first base (114) and a first wall (115) arranged therebetween. The second chamber (120) comprises a second access port (123) opposed to a second base (124) and a second wall (125) arranged therebetween. A first normal N1 to the first base (114) extends through the first base (114) and the second base (124). A sewer network 1000 and a method of installing the sewer network are also described.

The invention relates generally to an arrangement (100) for connecting sewerage system and a French drain. The arrangement for a sewerage system comprising a French drain comprises 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 wherein said inspection well device (102) further comprises a bottom part (104) and a tube part (106) protruding from said bottom part (104) whereby preventing the unwanted water and dirties entering into said French drain.