The use of decentralised, sustainable urban drainage systems (SUDS) for thetreatment of stormwater runoff is becoming increasingly prevalent in Germany.Decentralised SUDS can offer a viable and attractive alternative to end of pipe treatmentsystems for stormwater runoff from urban areas. However, there is still some uncertaintyregarding the long-term performance of SUDS, and the general legislative requirements forSUDS approval and testing. Whilst the allowable pollution levels in stormwater runoff thatinfiltrate into ground and/or water table are regulated across Germany by the Federal SoilProtection Law, there is presently no federal law addressing the discharge requirements forsurface water runoff. The lack of clear guidance can make it difficult for planners anddesigners to implement these innovative and sustainable stormwater treatment systems.This study clarifies the current understanding of urban stormwater treatment requirementsand new technical approval guidelines for decentralised SUDS devices in Germany. Thestudy findings should assist researchers, designers and asset managers to better anticipateand understand the performance, effective life-spans, and the planning and maintenance requirements for decentralised SUDS systems. This should help promote even greater useof these systems in the future.
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