These sandstones and siltstones were crushed and compacted to form the dam embankment. The embankment also contains approximately  of processed basalt. This material was incorporated into various filters and drains within the embankment to cope with seepage within the embankment and foundations.
The dam's embankment was created by crushing and compacting these sandstones and siltstones. The embankment also contains roughly of processed basalt, which was incorporated into various filters and drains to handle seepage within the embankment and its foundations.