Ko te aratohu iti a te STW he kowiri tira. Ko te Kowiri tira (kowiri tira) he whakarāpopototanga mō te kowiri tira ātete-waikawa, ātete ki te hau, te mamaoa, te wai me ētahi atu momo waikura ngoikore, te kowiri tira rānei he āhuatanga kowiri tira e kiia nei ko te kowiri tira.