Umbhobho weSpiral (SSAW) ngumbhobho wentsimbi wekhabhoni ojikelezayo owenziwe ngomtya wentsimbi njengesixhobo sokukhuselwa, usoloko ukhutshelwa ngokufudumeleyo, kwaye udityaniswe yinkqubo yokuwelda yearc ezenzekelayo enamacala amabini. Isetyenziswa ikakhulu kubunjineli bokubonelela ngamanzi, i-petrochemical, ikhemikhali, amandla ombane, ezolimo...
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