Description

Ngwa: N'ihi na waterproofing ojiji na ulo oru & obodo ụlọ gụnyere akwụkwọ ndụ akwụkwọ ndụ ụlọ, larịị ụlọ na sloping elu ụlọ.
N'okpuru ala waterproof: reservoir, dam, ọdọ mmiri. ojiji mmiri na-adịghị na Ọwara, ebe a na-adọba ọka, injinịa artificial, ihe mkpofu ahịhịa, ọdọ mmiri artificial.


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