The semi-circles prevents surface erosion and encourages infiltration. Organic matter in the semi-circles attracts termites and other destruents, creating macropores in the soil. According to local communities, preparation of 1 ha amounts to two to four person-months of work, and yearly maintanance of approximatly one-person month is required.
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í-kpó-áhà – Ị ga-enyerịrị ugo kwesịrị ekwesị, nye njikọ na ikikere ahụ, ma gosikwa ma emere mgbanwe. Ị nwere ike ime ya n'ụzọ ezi uche ọ bụla, mana ọ bụghị n'ụzọ ọ bụla na-egosi na onye nyere ikikere kwadoro gị maọbụ ojiji gị.
gbásàa kà – Ọ bụrụ na ị tụgharịgharịa, gbanwee, ma ọ bụ wulite n'elu ihe ahụ, ị ga-ekesa ndenye gị n'okpuru otu ma ọ bụ ikike dakọtara dị ka nke mbụ.