Commonly, when floods sweep through cities/villages, it picks up dirty material. The water can then contaminate other drinking water, which could lead to waterborne illnesses such as:
Dysentery
Typhoid fever
SARS
volcano,tsunami,earthquake,hurricane/cyclone,tornado,drought,flood,blizzard,avalanch,thats all i can think of
This link has all the info you need.
A cyclone is a large-scale weather syetm in which air circulates around a center of low pressure. Cyclones often bring stormy weather. A flood is any event in which significant amounts of water are present on land where it would not normally be.
Natural disaster.
The southwest region in bangladesh are floodplains as it is merely about 10 feet above sea level. Whatever flood barriers it has, it is always washed out by a flash flood, which happens whenever cyclone strikes.
malaria
rain and flood because the cyclone produces rain and if its big enough it could cause floods
There is a potential for water born diseases like cholera and hepatitis A after a flood. Also flooding increases the risk of malaria and dengue.
the cyclone twister
soil erosion , flood , diseases
Aside from death and injuries caused by Cyclone Tracy the Authorities in Australia got on top of the situation sufficiently to avert the outbreak of disease, by evacuating people as soon as possible.
there are cyclone and flood shelters being made at this very moment, this means that more people will live through disasters because the warning is given before a flood or cyclone hits Bangladesh. also it lets people gather their belongings and have a place to stay. most of the time they are very crowded which is why they are trying to make more, hope this helps.