Ko te paera awhina pehanga he taputapu e whakamahia ana ki te whakaiti me te whakahaere i te pehanga o te wai, te hau ranei, e mohiotia ana ano he paera haumaru, he paera inihua ranei. Ko tana mahi nui ko te whakaiti me te whakahaere i te pehanga i roto i te punaha i raro i te kaupapa o te tiaki i te haumaru o nga taputapu me nga kaimahi.
Ko nga reera totika he waahanga nui i roto i nga punaha whakahaere wai hou, e whakarato ana i te tika me te ngawari e hiahiatia ana mo te whānuitanga o nga tono.
Ko te takirere he takirere hei whakahaere i te rere o te wai i roto i te paipa. Ko tana mahi ko te whakahaere i te rere o te wai ma te huri i te waahanga toronga, te roa ranei o te katere. Ko te maapono mahi o te maareti maataki e pa ana ki te whakarereke i te rahi o te waahanga whakawhiti paipa ki te pa ki te rere o te wai.
Ko te takitaki, e mohiotia ana ko te reera kore-whakahoki mai, he waapa kotahi-ara ranei, he taputapu maamaa engari he mea nui i whakamahia i roto i nga momo punaha wai hei tuku i te rere o nga wai (wai, hau ranei) ki te huarahi kotahi.
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