What do you consider the difficulties are in mounting a flood rescue operation in a developing country?

I’m a university student and as part of our assessment for a module I have just completed we have to do a presentation on flood/sea/swift water rescue, with a medical focus.
I’m looking at the difficulties presented in mounting an aid or rescue operation in a developing country after flooding, and was wondering if anyone else had any thoughts? I’ve been thinking along the lines of lack of infrastructure in the country to work with, lack of training, lack of resources, but I’m also having some problems finding resources, so any suggestions would be most helpful!