Adoption is the process of taking legal responsibility for SuDS devices for their whole life, which includes maintenance responsibilities. There is no definitive guidance on which authorities can adopt certain SuDS as each project will have different requirements. For piped systems, there is definitive guidance set out in Sewers for Adoption, and developers are responsible for constructing systems to specified standards. For SuDS, advice on model agreements for adopting SuDS devices is set out in the Interim Code of Practice for Sustainable Drainage Systems, produced by the National SuDS Working Group.