In the 2000's,
São Paulo followed the traditional approach and built massive underground reservoirs to deal with the outflow of Tietê and Pinheiros rivers.
Before that, every light rainfall made them to overflow and flood the highways spelling chaos over the city. Now, it never happens, despite São Paulo being a tropical/subtropical city (1,400mm/55 inches).
Very recently, aside zoning law estipulations, there are those micro-interventions Downtown, called "jardins de chuva" (rain gardens). It would all be very mundane if they weren't located on busy, rough, very grey corners of Downtown SP:
Article:
https://avidanocentro.com.br/cidades...dins-de-chuva/