Ka whakamahia te perehi hiko whakamaoritanga mo te whakamaroketanga me te whakamakuku o nga wai para.He wai te wai me te nui o te totoka iri, ka puta mai i te maimoatanga wai para, te ahumahi tukatuka kai, te ahumahi matū me etahi atu peka mahi a te tangata.

Ko te miihini whakapoi wai-a-waa he taputapu wehe totoka-wai hou, e whakamahi ana i te maapono tangohanga wiri, ka whakaputa i te kaha o te tohanga ma te huringa o te diameter o te wiri me te pitch, tae atu ki te waahi iti i waenga i te mowhiti neke me te mowhiti mau. , ki te mohio ki te whakahekenga o te whakahekenga o te paru.