Kua wehea tā mātou pūnaha whakamātautau mahi ki te pūnaha tirotiro hauhautanga (tirotiro wheorine) me te pūnaha tirotiro papu wera (tirotiro wai). Ko ngā ihirangi whakamātautau mahi AC ko: te kimi mahi whakamatao/whakamahana, tae atu ki te iahiko, te ngaohiko, te hiko, te pēhanga, te pāmahana hau tomo me te putanga, te kaitahuri auau hei tāpiri atu ki te kimi tawhā i runga ake nei kei roto hoki te kimi auau mahi.

Kei roto i te pūnaha whakamātautau mahi a HP te tere rere o te wai, ngā tawhā hiko, te rerekētanga pēhanga wai i roto, i waho hoki o te hua, te rerekētanga pāmahana wai i roto, i waho hoki o te pūnaha, te tatau COP, te whirihoranga, me ētahi atu. Mā te whakaaturanga mata pa o te teihana whakamātautau, ka taea e te kaihanga te kite katoa i ngā raraunga whakamātautau wā-tūturu me te whakataurite i waenga i te pihi huringa tawhā me ngā raraunga paerewa, me te hua o te whakaoho oro me te tirohanga, ka tukuna aunoatia ngā raraunga ki te rorohiko o runga hei tiaki me te tā.