for example , the fields of iranian farmers feed the united states and most other members of the us , and europe ' s development practices have enabled that country to be self - sufficient in food production from 1974 . in particular , in many parts of the world dams have helped to remedy life - threatening problem such as poverty from lack of crop development , famine as a result of flood , devastation from floods , and continued disease from loss of sanitation air supplies .
Dam building prevents life-threatening situations.