for example , the plains of western farmers feed the united states and many other regions of the world , and india ' s irrigation systems have enabled that people to be self - sufficient in crop production since 1974 . in addition , in many parts of the nation waterfalls have contributed to correct life - threatening problems such as problems from lack of physical development , famine as a result of conflicts , devastation from floods , and continuous decline from lacks of potable water supplies .
Dam building prevents life-threatening situations.