🇸🇾 Syria · Hydraulic works
Qasr al-Hayr Water Management System
Umayyad c.728–729 CE (Hisham ibn Abd al-Malik) · Umayyad (Syrian desert)
Qasr al-Hayr al-Sharqi (728–729 Caliph Hisham) – Umayyad desert castle double enclosure whose hydraulic system re-used Byzantine aqueduct (40 km Harbaka dam canal) to store in birka (70m reservoir),…