A rare example of a dam that still maintains its function even with more than a half of it under water is Numamoto Dam (also known as Tsukui Dam) which is over the main stream of the Sagami-gawa River, and although more than half of its body is under the water of Lake Tsukuiko created following the construction of Shiroyama Dam downstream, it still functions today.
ダムが半分以上水没しながら現在も機能維持している例は少なく、代表的な例としては相模川本川に建設された沼本ダム（津久井ダム）で、下流の城山ダム建設に伴い出来た津久井湖によって半分以上水没しているが、現在も機能を維持している。