However, failure to remove contaminated materials and to reduce
moisture and humidity can present serious long-term health risks. Standing water and wet
materials in the home can become a breeding ground for microorganisms: bacteria, mold,
and viruses. They can cause disease, trigger allergic reactions, and continue to damage
materials long after the flood.
Flooding need not always be a problem. In some circumstances it is an important natural process which has beneficial impacts for biodiversity and soil health, for example. However, if it occurs in the wrong place a flood event can have significant negative economic and social impacts. the flooded had destroyed homes, schools, public places and shelter, killing human beings animals or any living thing and transport.
The problems start when flooding occurs in areas of large-scale human development of the landscape. Floods are problems disrupt normal drainage systems in cities and typically overwhelm sewer systems. On the problems side, Growing plants in wet, poorly drained soil can be quite difficult. To the extreme, very heavy rainfall followed by flooding can not only cause tremendous damage to buildings and homes, but also can kill woody and herbaceous plants. Additionally, floods disrupt many people's lives each year and personal tragedies due to flooding occur frequently.