Tātaitai Rahi Tāngata Wai

Hei matapae i te nui o te wai ua e taea ana e koe te kohikohi mai i to tuanui, whakamahia tēnei tikanga: ko te rohe hopu tuanui i roto i ngā mita tapawha whakareatia ki te ua ā-tau i roto i ngā milimita, wehea ana ki te 1,000, ka hua mai te kohikohi ā-tau i roto i ngā rita. Ka whakamahia tētahi kēhi hua kohikohi o te tata ki te 0.85 ki te 0.90 hei kaute i te rore haere, ngaro-kurukuru-tuatahi, me te rere noa. Hei tauira, ko tētahi tuanui 150 m2 i Wellington (tata ki te 1,200 mm ua ā-tau) ka taea te hua ki te 150 x 1,200 x 0.85 / 1,000 = tata ki te 153,000 rita ia tau. Ko tētahi kaiwewete kurukuru-tuatahi, e whakawehe ana i ngā rita maha tuatahi o te ua e horoi ana i ngā kino mai i runga i te tuanui, ka tino whakaiti i te poke. Ka pā anō te tikanga tuanui ki te kounga: ko ngā tuanui maitai kati te mea e hiahiatia ana nui ake i ngā rākau kaarana, paraone rānei mō te kohikohi wai inu. Puna: Raraunga ua a-rohe NIWA (niwa.co.nz); Building Performance (building.govt.nz).

Ko te rahi o te tanga i Aotearoa ka whakatauhia e to whakamahinga wai, ngā āhua ua, te rohe hopu tuanui, me te mea ko te tanga to tohu whakarato anake, tāpiri rānei. Mō tētahi kāinga o te 3 ki te 4 tangata e whakamahi ana i tētahi tanga hei whakarato anake, ko te 25,000 ki te 50,000 rita he tautuhi noa. Ka tūtohutia pinepine tētahi taupuni rokiroki o te 90 ra i ngā rohe maroke pērā i Canterbury me Hawke's Bay, e iti ana te ua o te raumati. Ko te tikanga rahi-tanga matua: ko te whakamahinga wai kāinga ia rā (rita) whakareatia ki te maha o ngā ra rokiroki e hiahiatia ana. Ko te nui o te whakamahinga wai kāinga NZ ko tata ki te 150 ki te 200 rita ia tangata ia rā. Mō te whakamahi tāpiri pērā i te horoi maara, horoi wharepaku, horoi kakahu rānei, ko te tanga 5,000 ki te 10,000 rita ka neke te rite. Ka taea e to kaiwhakauru, umanga paipa raihana rānei mōhio ana ki ngā raraunga ua-a-rohe te āwhina ki te rahi i to punaha ki te tino tika. Puna: Building Performance clause G12 (building.govt.nz); NIWA (niwa.co.nz).

He nui rawa atu te rereke o te ua i Aotearoa na tōna whenua maunga me tōna tūnga i ngā punaha huarere o te Moana Taihape. Ko ngā nama toharite ua ā-tau a-rohe mai i a NIWA ko tata ki: Tāmaki Makaurau 1,200 mm; Whangarei 1,600 mm; Kirikiriroa 1,200 mm; Te Whanganui-a-Tara 1,250 mm; Whakatū 960 mm; Otautahi 640 mm; Otepoti 800 mm; Waihopai 1,040 mm; Te Tai Poutini (Westland) 5,000 ki te 10,000 mm. He nui te wā-o-tau o te ua i roto i ngā rohe maha: ko te tahatai rawhiti o ngā motu e rua te tikanga ko te maroke i te raumati, ko Te Tai Poutini ka whiwhi ua puta noa i te tau. Mō te rahi tanga me te whakamahere kohikohi wai ua, he nui te hiranga o te whakamahi i ngā whakaaweawe ua ā-marama i te wāhi o ngā tapiri ā-tau, na ko ngā maroke raumati ka whakatau i ngā hiahia rokiroki. Ka tuku a NIWA i ngā raraunga huarere-a-rohe koreutu ma tana papamahi CliFlo. Puna: Raraunga huarere-a-rohe NIWA (niwa.co.nz).

Ae, ko ngā punaha kohikohi wai ua i Aotearoa ka haurapa e te Waeture Hanga Whare, inā koa ko te Kupu G12 (Whakaratonga Wai), e tauira ana i ngā hiahia whakahaere mō ngā punaha whakarato wai e whakamahia ana mō te kai a-tangata. Ko te wai e whakamahia ana mō te inu me tutuki i ngā Paerewa Wai Inu o Aotearoa, e hiahia ana ko te wai he haumaru, whakaaetia, rite hoki mō tōna tikanga. Mō ngā tanga e whakamahia ana hei whakarato anake mō te wai inu, ka hiahiatia he punaha maimoatanga, pērā i te kaiwewete kurukuru-tuatahi, tātari tuaahu, me tētahi waeine whakamakuku ultraviolet (UV). Me hanga ngā tanga, ngahere, me ngā nekenga i ngā materia kai-kaupeka rite ana ki AS/NZS 4020 (whakamatautau hua e pa ana ki te wai inu). Me whakahaere te whakauruhia e tētahi umanga paipa raihana. Ka rereke ngā hiahia manawhakaae e ai ki te kaunihera, na me tono ki to kaunihera-a-rohe i mua i te whakauru tanga nui. Puna: Building Performance Clause G12 (building.govt.nz); Aratohu wai inu Ministry of Health (health.govt.nz).