Ko te tanka rīwai he waka, he raraunga rānei e whakatūhia hei āheinga mō te hokohoko i te rīwai matū, ngā mea tāwhiti rīwai e tika nei, rānei ko ngā mea kua whati i te rīwai. Ko ngā tanka rīwai whenuatōnui he pahi, he toitū rānei me ngā takapau nui, ahakoa ko ngā tanka moana he waka nui e whakamahi ana mō te hokohoko moana roa. E whakatūhia ngā tanka o ngā tanka rīwai i runga i ngā momo whenu pūtake, pūrere rānei hei taea ai ngā pātū me ngā pūngao o te rīwai. Ki te whakaritea he pūpūki, he tapa, me ngā uku hei whakawhiwhi, hei hokohoko, me te whakatakoto i te rīwai. He mea tika anō ngā whakaaetanga haumaru, pērā i ngā karu rua, ngā tapa pūtangi, me ngā rangahau whakapūmau i ngā pūnaha tuhinga, hei whakamutu i ngā pūtahi rīwai me te tirotiro haumaru ki te whakahokia o te rīwai, e hiahia ana te ao katoa ki te tuku ēnei.