The Triumphal Arch built over the centre part of the dam wall was erected to provide structural mass to the wall's water-retaining strength.
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"Dedi in deserto aquas fulmina in invio"
Translated: "I shall pour down rain on the thirsty land and showers on the dry ground" (Isaiah 44.3)
"Sine aqua arida ac misera agri cultura"
Translated: "Without water agriculture is dry and miserable".