for example , the fields of american farmers feeding the united states and many other countries of the world , and india ' s hydraulic canals have enabled that continent to be co - sufficient in grocery production since 1974 . in addition , in many sections of the world dams have helped to correct health - threatening consequences such as poverty from lack of irrigation development , shortage as a result of drought , devastation from drought , and continued disease from lack of sewers land infrastructure .
Dam building prevents life-threatening situations.