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The Xe NamnoyDam is designed as a rockfill embankment with central core. Itsmaximum height is about 78 m and its crest length is about 1,560 m.
A diversion tunnel excavated into the right abutment will allow dryingthe riverbed for the construction of the dam. The un-gated spillway is also located on the rightbank

ロックフィルって書いてあるけど