Ko te whakahaere i ngā totoka he tukanga e whakamahia ana i roto i ngā taputapu keri e whakamahi ana i te wai keri. Ko te tikanga he wehewehe i ngā "tapahanga" (ngā rauemi kua keria) mai i te wai, kia taea ai te hurihanga anō, te tuku rānei ki te taiao.[1]
Ka pā te pūnaha whakahaere totoka ki te tukanga keri puna hinu me te hau 1000-9000 mita te roa, ā, e 3 ki te 7 ngā tāke whakakotahi kua whakarōpūtia. Kei raro o te tāke purenga he hanganga turanga kōne hou, ko te taha ia he pūnaha whakaranu paru e kore e ngāwari ki te whakatakoto onepu. Hei whakatutuki i ngā whakaritenga o te mahi keri, ka taea te wehe me te hono i te pūnaha tohanga katoa i waenga i te tāke me te tāke, i waenga rānei i te whare putunga me te whare putunga, i roto i ēnei ko te takirere raro o te manifold momi ka tuwhera ngāwari, ā, ka hiritia pono i muri i te katinga. Kei roto i te pūnaha tohanga katoa ngā taputapu purenga taumata 5, te ruirui kirikiri i roto i ngā taputapu whai muri, te horoi onepū me te parapara, te tango hauhautanga me te whakaoho me ētahi atu. Mā te whakamahi i te pūnaha purenga paru keri hinu hou ka whakaitihia ngā tukunga paru me te mahi mārama o te tiaki taiao.
Ko te pūnaha whakahaere totoka e whakamahia ana hei wehewehe me te whakahaere i ngā paru me te onepu me ētahi atu matūriki i roto i te wai keri, hei pupuri i te mahi a te wai keri, me te penapena i te rere o te wai keri. He taputapu whakaranu taumaha, he taputapu whaowhia me ngā taputapu whakakī matū, e whakamahia ana hei whakapai ake i te mahi ā-tinana me te matū o te wai keri kia tutuki ai ngā whakaritenga o te mahi keri.
Pūnaha whakahaere totoka i hangaia eHĒRI, kei a ia ngā āhuatanga o te mahi matatau, te mahi pono, te nekehanga ngāwari me te whakahaere ōhanga. Kua eke te mahi me te kounga hanga o te pūnaha huinga katoa ki te taumata matatau o te momo hua o roto.