The original Auckland Regional Council’s Technical Publication 10, “Stormwater Treatment Devices Design Guideline Manual” (TP 10) has been actively used by design engineers, developers and councils around New Zealand since October 1992. The document has been the mainstay of stormwater managers and spans a time of immense changes in Auckland. These have included not only evolution in stormwater management thinking - with a growing emphasis on developing water sensitive city philosophies - but also the enormity of amalgamation and the formation of Auckland Council. All these factors have necessitated a fundamental review of TP10 and the development for technical design guidance for stormwater management devices in the Auckland Region. This paper will present the core changes in Auckland’s stormwater management philosophy, the move towards adaptable management and the elements of consultation being undertaken by Auckland Council.