Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Don karewa daga sanyi, yawancin magudanar ruwa ya gudana kusan mita 1 a ƙarƙashin ƙasa. Binciken archaeological ya nuna cewa, a matakin mafi ƙasƙanci, injiniyoyin Romawa sun sanya dutsen dutse. A kan wannan tushe, sun sanya kankare ko dutse mai siffar U don ruwa kuma, a kan wannan, an yi amfani da duwatsu da kuma turmi don gina kariya mai kariya.  Tambaya: Yaya zurfin ramin ruwa ya gudana?
Ƙarƙashin ƙasa