Output from three different scenarios generated using stormwater management planning support software to reduce occurrence of combined sewer overflow events through the use of green infrastructure. This dataset is associated with the following publication: Fu, X., H. Goddard, X. Wang, and M. Hopton. Development of a scenario-based stormwater management planning support system for reducing combined sewer overflows (CSOs). JOURNAL OF ENVIRONMENTAL MANAGEMENT. Elsevier Science Ltd, New York, NY, USA, 236: 571-580, (2019).