The european research scholars
The european travelers had examined the canal zubaidah and its lakes. They have mentioned their views about the lakes. They wrote that the lakes of canal zubaidah were the beautiful examples of architectural excellence.
Muhammad hammad al-baqaawi says: Hardened roks, wells and lakes were cut with a new technology. The rocks were given heat treatment before they cut with a specific method. To arrange the rocks a special type of cement material was used.