Some basics - for every 4m² of non permeable pavement 1" (2.5cm) of rain will dump 1 Ton (1000 ltr) of water into the drainage system with no attenuation (lag between rainfall & surge)
With the space to get in a car parking space = 20m²
Look at the outfalls of storm drainage and they have flap valves to prevent back feeds from the rivers &c where they discharge https://www.flickr.com/photos/h52/51208469137/in/datetaken/ Of course when the tide comes in/river levels rise the flap closes, and the drain backs-up until the pressure forces water to flow past the valve. This caused the drain to 'explode' at Carron Water & derail the train.
Measures like attenuation 'ponds' parks, car parks, roads, that can be flooded with minimal consequences are a way to deal with this, especially if they can be 'grass' as 1 ha can soak up around 5,500 m³ per year. A good reason to rip out unnecessary tarmac and put in 'rain gardens'