for example , the plains of western farmers help the u states and many other parts of the world , and india ' s irrigation systems have assisted that country to be self - successful in grocery output since 1974 . in comparison , in many parts of the world projects have helped to overcome life - causing problems such as poverty from lack of industrial development , shortage as a result of drought , destruction from floods , and continued disease from lacked of potable water supplies .
Dam building prevents life-threatening situations.