How can we, designers, help?

Every year and in several parts of the world there are natural disasters such as floods. Like in Indonesia at the end of last year or think of the floods in Sub Saharan Africa. Many people lost their lives and those who are left behind are usually left behind with anything. How could we, as designers / architects / engineers, prepare to catch those who are left behind without any shelter or food. Can we propose ideas / concepts which will get them back on their feet in no time so that they can start taking care again of themselves and others?