joanna, i was going to mention that. So much water goes to waste, today roads were flooded. But from the other point of view: will it be possible to collect that water with minimal expenses and energy used? I guess city planners should have implemented rain water drainage collecting points right when they implemented the sewage system. But again, i dont think this will be cheap and thats why this is the reason for not doing it. I deal with architectural plans from UK on daily basis, and on most of the plans all drainage pipes lead to a single point which then connects to an underground drainage system.
Imagine how much water could be collected in a single day, even for industrial or agricultural purposes, still.
Anyway, hoping and praying for rain is useless, the government should take actions instead of pointing fingers on regular people. The demand is constantly growing and no plans were implemented for ages.