ABSTRACT
Large dams may have a hydrologic design scale of probable maximum flood. Levees around cities, however, normally adopt the design scale ranging 50 to 200 years of return period for water-control. The release amount of water was increased from the existing and new spillways, and then the discharge of main stream exceeded the design flood amount, which resulted in the inundation of the residential area with the lives and property damage. Appropriate flood protection measures are essential to a large dam and the downstream levee that have unbalanced design scales for water-control. Heavy rainfall with the return period of 500 years locally poured in the upstream region of Daeam dam built on a tributary.
