1. Nchekwa gburugburu ebe obibi, idebe ihe ọcha (dị ka ihe mkpofu ụlọ, ọgwụgwọ nsị, ebe a na-ekpofu ihe ndị na-egbu egbu na ihe dị ize ndụ, ụlọ nkwakọba ihe dị ize ndụ, mkpofu ụlọ ọrụ, ihe owuwu na ihe mgbawa, wdg). 2. Nchekwa mmiri (dị ka osimiri na ọdọ mmiri reservoir dam dam seepage,...
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