The Bali Province Government plans the development of Bali Cultural Centre as a comprehensive cultural information centre to support the development of Culture-oriented Bali Tourism. The Bali Cultural Centre site is situated in an area of post-mining remnants in Klungkung Regency. The sites located at coordinates 8°32‘41.35” - 8°34‘30.94” South Latitude and 115°24‘54.92” - 115°26‘6.99” East Longitude. This site is also portion of estuary area of the Unda River which has a high potential for the danger of cold lava flood from the Mount Agung eruption. The structure to manage cold lava floods at the Unda River estuary is being conducted. The construction is divided into two locations which design to satisfactory a 50-year design flood with discharge of 1436.11 m3 per second. The first location is at upstream (north side of Prof. Ida Bagus Mantra Street) using a single rectangular cross section. The second location is at downstream (south area of Prof. Ida Bagus Mantra Street) using a combine double rectangular cross section. These two types of cross sections are designed to accommodate the capacity of water discharge under normal conditions and still able to drain water discharge in the 50-year return period. The presence of this channel allows the cold lava flood flow directly towards the sea-shore and so as to reduce the risk. It is possible that the sediments settle at the base of the channel, therefore, channel shape normalization and periodic dredging for maintenance are essential.