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The paper focuses on seal defect of dam system of an impoundment with deposition of calcareous sludge. The seal defect of the impoundment dam system, consisting of a homogeneous ground dam, occurred due to its underflow by desludged water. This paper lists causes of the underflow at the dam system, based on analysis of the original engineering-geologic survey, construction method of the dam body, floating method at the impoundment and additional engineering-geologic survey. The primary cause of the defect is prese...