Ogwe Semicircular
A semi-circular bund (nke a makwaara dị ka a half-lune ma ọ bụ half-moon) bụ usoro owuwe ihe ubi mmiri ozuzo nke na-agụnye igwu oghere semilunar n'ime ala na oghere na-aga n'ihu na mmiri na-asọ.

Ihe ndị mere n'oge gara aga 
Oghere ndị a na-eche ihu na ndagwurugwu nke ala, na-emepụta obere dike n'ebe gbagọrọ agbagọ na ala site na oghere ahụ n'onwe ya, yabụ ha na-ejide mmiri ozuzo na-agbadata ugwu.

Ihe owuwu ndị a na-enye ohere ka mmiri banye n'ime ala, na-ejigide mmiri dị ukwuu n'okpuru ala. Mana, ọ na-egbochi ọnwụ nke ala na-eme nri.

A na-eji oghere ndị dị gburugburu eme ihe iji weghachite mpaghara kpọrọ nkụ nke nwere usoro mmiri ozuzo na-adịghị mma, na-enye ohere uto nke osisi na osisi, dịka na Sahel.

Hụkwa 

 Zaï
 Negarim
 Mmiri na-abanye
 Ịkọ ugbo gburugburu
 Nnukwu Mgbidi Na-acha Akwụkwọ ndụ
 Mmiri ozuzo na Sahel

Ihe odide