Performance assessment for the integrated green-gray-blue infrastructure under extreme rainfall scenarios

Synergistic allocation of urban stormwater infrastructure is critical to flood risk prevention and control under extreme rainfall events. This study focuses on the interaction regularity green, gray, blue in process runoff retention discharge scenarios. Three strategies, namely, gray infrastructure, green-gray green-gray-blue are proposed analyze effectiveness different scenarios capabilities drainage systems determine key influencing factors three strategies. The results show that demonstrates synergy improving efficiency systems. Under gravity conditions, backwater jacking caused by high river water levels has a certain impact smooth case identified sensitive range influence level function an adaptive which increases slightly with increase. These present notable rules synergistic effect integrated system.