Many kinds of fishways were installed approximately 5,500 in Korea. However, it was a big problem that the fish to move from down to up streams for spawning just in dry season. When flooded, the exit of fishway also was blocked by sediments, stones, wood chips and vinyls etc. It is not a simple slab of configuration but also well designed and constructed a total fishway system with sediments block and underground passage allow fish to continue moving.