It caused health problems, is changing the ecology of water from areas where flow water is stagnant water, which is generally after the dam was built, we often find the symptoms with the ecosystem reservoirs diseases such as malaria, elephantiasis and schistosomiasis. The carrier of disease has three kinds is the aedes, black mosquito and snail that can breed as well. Therefore after the dam was built, we have to manage the sanitation system, irrigation system and water consumption to prevent the epicdermics of this disease.