Takaitaccen Bayani:

Ƙayyadaddun bayanai: Bawul ɗin bawul ɗin bawul ɗin hanya ɗaya ne wanda aka sanya a mashigar bututun magudanar ruwa akan madatsar ruwan kogin. A ƙarshen bututun magudanar ruwa, lokacin da magudanar ruwa a sama ya fi ƙarfin matsewar ruwan kogin, bawul ɗin flap zai buɗe. A gefe guda, diski ɗin bawul ɗin zai rufe kai tsaye don hana kogin ruwa zubowa cikin bututun magudanar ruwa. Aikace-aikace: Ya dace da ruwan kogi, ruwan teku, ɗan ƙasa da najasa masana'antu da dai sauransu No. Sunan Mat...