Arch–gravity dam

It is a dam that curves upstream in a narrowing curve that directs most of the force from the water against the canyon rock walls, which provide the force to compress the dam.

A gravity dam requires a large volume of internal fill.

[3] An arch–gravity dam incorporates the arch's curved design which is effective in supporting the water in narrow, rocky locations where the gorge's sides are of hard rock and the water is forced into a narrow channel.

Typically, arch–gravity dams are built in canyon-like terrain, with the surrounding cliffs serving as supporting walls.

[5] An arch-shaped bank-fill design reduces the overall mass of the structure and the cost of construction compared to pure gravity dams.