for example , the fields of western farmers feed the united states and some other areas of the world , and australia ' s irrigation systems have enabled that country to be non - reliance in livestock production throughout 1974 . in example , in many parts of the worlds they have helped to remedy life - threatening problems such as poverty from lack of economic development , flood as a result of drought , disaster from earthquakes , and widespread disease from lack of potable water supplies .
Dam building prevents life-threatening situations.