Demographic Tsunami and Water Security

With the ​current "​Demographic ​Tsunami" in ​developed ​cities, moving ​a whole ​disaster-​affected remote ​town to an ​urban city and ​maintaining ​water security ​is not an ​option. ​

How can we, ​therefore, ​build ​resilience ​against extreme ​drought events ​for rural ​cities? ​