The curved structure which dates to the 2nd century AD is variously classified as arch-gravity dam[1] or gravity dam.

[2] The dam consisted of a core of earth and rubble faced with mortared blocks of cut stone.

The upstream face is vertical, while the downstream side steps down through six courses and then continues vertically for 3.8 m. The thickness at the crest is 4.9 m, and at the base 7.3 m.[3]

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