I have colleague who’s an engineer and he’s buried a big rain barrel in his yard, using the water for toilet and such things. the water is collected from the roof through drainpipes and such, then goes through sand filter before entering the tank.No matter in which city you are and how green it is if the storm is big you will always have problems. In a gigantic city like Istanbul which has a pretty hilly terrain too you will always have lower points where most of the water will go during a big rain.
The bigger problem for me here is what happens with all this water. I am absolutely sure that 99% of all rain water over Istanbul goes to waste- to the sewers or to the sea. With the climate changing and water resources getting more and more important I think that everywhere around Turkey there should be investments into systems for collecting rain water. It’s a Technology that is more and more widely used in modern skyscrapers and architecture plus it’s not hard and expensive to be used by households too.
he has solar panels to work the pump to get the water into the system. Now if only batteries became cheaper