Abstract: This paper documents a case study of the analysis on the seepage aspects of a manmade lake. The hydrological and geological conditions, karst terrain development as well as the seepage properties at the lake area are studied so that the seepage conditions and boundaries could be determined as a result of these analyses.  The directions and the quantities of the seepage underneath the manmade lake are determined. The results show that the aquitard layers exist at both east and west side of the lake and the seepage mainly occurs from the north to the south throughout the bedrock fissures. The estimated total seepage quantity is 7.21 cubic meters per day and this quantity is a weak seepage compared with the size of the lake. It is concluded that the leakage prevention measure is not necessary for this manmade lake.

Key words: Manmade Lake, Water Leakage, Leakage Prevention