Thank you for the illustration; unfortunately it contains few specifics.
Exactly where along the Nile was the “Isis Dam” located? In what era was it built?
Also, would you please address the three (3) questions from my original query?
“Quis custodiet ipsos custodes?“ - Decimus Junius Juvenalis
Η άγνοια είναι η μητέρα του μύθου και του μυστηρίου.
“Numero, Pondere et Mensura“