Te Whakamahere me te Whakatinanatanga o ngā Pūnaha Waikeri Tāone
Ko te waikeri o te tāone tētahi o ngā hanganga matua e tino whakatau ana i te kounga o te oranga i roto i te tāone. Ina kore e whakamaheretia, e whakatinanahia hoki ngā pūnaha waikeri, ka nui ake ngā pānga i te waipuke i runga i ngā rori, tae atu ki te whakararuraru i te nekenekehanga, te kino o ngā rawa, te pikinga o ngā utu tiaki rori, te whakahekenga o te kounga o te taiao, tae atu ki ngā mōrearea hauora tūmatanui mai i te wai poke. I waenganui i te huringa āhuarangi e hua ake ai te ua nui me te tere o te noho tāone e piki ake ai te hiahia mō ngā mata kore e uru ki te wai, kua noho te whakamahere me te whakatinana i ngā pūnaha waikeri o te tāone hei mea rautaki, ehara i te mea he kaupapa hangarau noa iho.
Ngā Ariā Taketake o te Waikeri Tāone
I te nuinga o te wā, ko te waikeri tāone he pūnaha e whakawhiti ana, e whakahaere ana hoki i te wai, inā koa te wai ua (rerenga wai) me te waikeri mata, hei ārai i te putunga, i te waipuke rānei. Kāore i rite ki te waikeri taiwhenua, e whakawhirinaki nui ana ki ngā awa taiao, he rerekē ngā wero kei ngā tāone: he nui ngā mata whenua kua kapi i te uku me te raima , he iti te wāhi, he matotoru ngā ratonga o raro whenua, me te noho mai o ngā para o te whare e uru pinepine ana ki ngā awa. Nō reira, me hoahoa ngā pūnaha waikeri tāone hei whatunga whakauru, e uru ana ki ngā awa tuatahi, tuarua, me te tuatoru, ngā hanganga tautoko (ngā awaawa, ngā tomokanga, ngā tāke whakahaere), ngā puna pupuri/pupuri, me ngā papu i ngā wāhi motuhake.
Ko ngā huarahi hou e aro nui ana ki te waikeri pumau, pērā i ngā ariā o ngā Pūnaha Waikeri Tāone Tauwhiro (SUDS) me te Whanaketanga Pānga-iti (LID). Ko te kaupapa matua ko te pupuri, te kuhu, me te whakaroa i te rere o te wai kia tata ki tōna pūtake, kaua e "tuku" noa i te wai i te tere rawa atu. He mea nui tēnei nā te mea he maha ngā wā ka nekehia e te rere tere ngā raruraru waipuke mai i tētahi wāhi ki tētahi atu.
Ngā Wāhanga Whakamahere Pūnaha Waikeri
1. Tāutuhia ngā Raru me ngā Whāinga
Ko te wāhanga tuatahi ko te mārama ki ngā raruraru o nāianei: ngā wāhi waipuke, te auau waipuke, te kaha o te awaawa, ngā aukati, me te whanaungatanga i waenga i te rerenga wai me te awa matua, te pūnaha awaawa rānei. Me mārama te whakatakoto i ngā whāinga whakamahere, hei tauira, te whakaiti i te waipuke i roto i tētahi wā hokinga motuhake (2–5 tau mō ngā rori o te takiwa, teitei ake mō ngā wāhi nui), te whakahaere i te kounga o te wai e rere ana, te whakanui ake rānei i te ātete ki ngā ua nui.
2. Te Kohikohi Raraunga
Ko te whakamahere i te waikeri he mea nui ki ngā raraunga e tika ana, tae atu ki:
– Ngā raraunga ua o ia rā me te kaha o te ua (IDF: Kaha-Roanga-Auautanga).
– Ngā mapi whenua me ngā pari whenua.
– Te whakamahinga whenua (whare noho, ahumahi, wāhi tuwhera matomato).
– Te whatunga hongere o nāianei me tōna āhua tūturu.
– Ngā raraunga oneone me te kaha whakauru.
– Ngā raraunga tai (mō ngā tāone takutai) me te teitei o te taumata wai o te awa.
– Ētahi atu mōhiohio ratonga (ngā paipa wai inu, te hau, ngā taura) hei karo i ngā raruraru huarahi.
Ko te kounga o ngā raraunga te mea e whakatau ana i te tika o te hoahoa. I roto i ngā tāone nui he iti noa ngā raraunga wai, me whai huarahi ātaahua, me rangahau i te mara, me whakatauira rānei i runga i te amiorangi me ētahi atu inenga.
3. Tātaritanga Wai
Ko te whāinga o te tātari wai ko te whakatau tata i te rerenga wai kua whakaritea. Ko te tikanga He tikanga whaitake pea te tikanga e whakamahia ana mō ngā rohe hopu wai iti, ngā tikanga hydrograph waeine rānei me te whakatauira ua-rerenga mō ngā awaawa nui ake. Ko ngā tawhā nui i konei ko te tauwehenga rerenga, e pāngia ana e te momo mata, me te wā kukū, e whakaahua ana i te tere o te taenga o te wai ki te awa matua.
Haunga te nui o te rerenga wai, ka whakaarohia hoki e te whakamahere hou te nui o te rerenga wai. He mea nui tēnei mō te hoahoa o ngā puna pupuri me ngā puna whakauru, e pupuri ana i te wai ua mō te wā poto.
4. Tātaritanga Waipēhi Whatunga
Kia mōhiotia te putanga wai i hangaia, ka whakahaerehia he tātari waipēhi hei whakatau i ngā rahi o te awa, te pari o te moenga, te tere o te rere, me te taumata wai. Me nui te awa hei kawe i te putanga wai me te kore e waipuke, engari kaua e nui rawa kia puhoi ai te rere, kia pupū ai te wai, kia āraia ai rānei. Mō ngā awa kua kati, me tirotiro te pēhanga, te kaha, me te urunga tiaki. Mō ngā awa tuwhera, me whai whakaaro anō hoki ki te haumaru, te ataahua, me te mōrearea o te para.
He maha ngā wā ka whakamahia te whakatauira mā te whakamahi i ngā pūmanawa (hei tauira, SWMM, HEC-RAS, ngā tūāpapa GIS rānei) hei aromatawai i ngā horopaki ua nui, ngā huringa whakamahinga whenua, me ngā pānga o ngā whanaketanga hou.
5. Kōwhiringa Otinga: Hanganga me te Kore-Hanganga
Ehara i te mea ko te whakanui noa i ngā awaawa te kaupapa o ngā otinga waikeri. Ko ngā kōwhiringa noa ko:
– Te whakatikatika me te whakaora i ngā awa kua pakaru/kua āraia.
– Whakanuia te kaha o te wai mā te whakawhānui, mā te whakakapi rānei i ngā paipa wai.
– He puna pupuri/pupuri hei pupuri i te nui o te tukunga.
– Ngā puna whakauru, ngā pū kōhao koiora, me te papa whakarewa hei whakanui ake i te whakauru.
– Ngā wāhi tuwhera matomato me ngā pāka urutomo hei hanganga matomato.
– Ngā pūnaha papu me ngā keti wai i ngā wāhi papaku, i ngā wāhi takutai rānei.
– Te whakahaere para me te mātauranga a te marea, tae atu ki te aroturuki i te whakakorenga para.
Ko te huarahi pai rawa atu he whakakotahi i ngā tikanga, e whakaritea ana mō ngā āhuatanga o te whenua, ngā utu, me ngā hiahia mō te wā roa.
Te Whakatinanatanga o te Pūnaha Waikeri Tāone
1. Te Whakarite i te Hoahoa Hangarau Taipitopito (DED)
Kei roto i te DED ngā tuhi hangarau, ngā tātaitanga hoahoa, ngā whakatakotoranga rauemi, ngā tikanga mahi, me mahere tahua ngā utu. I tēnei wā, me mahi tahi ngā tari whakawhiti kia kore ai te huarahi hongere e taupatupatu ki ētahi atu ratonga me te hanga roriMe whai whakaaro hoki te DED ki te urunga ki ngā mahi whakahaere me ngā mahi tiaki, pērā i te wāhi o ngā poka wai, ngā tāke whakahaere, ngā ara tirotiro rānei.
2. Te Hoko me te Hanga
He maha ngā wero e pā ana ki te whakatinanatanga o te mara: he iti te wāhi mahi, he nui ngā waka, me ngā āhuatanga o te whenua kāore e tutuki i ngā whakaaro. Nō reira, me whakatairanga e te kaiwhakahaere hanga te haumaru, te whakahaere waka, me te whakahaere kounga. Te whakamahinga o ngā rauemi Ka tīpakohia te rauemi e tika ana (te raima whakapakari, te pereki, te paipa HDPE, te paipa pouaka kua oti te hanga) i runga i te kawenga waka, te roa o te wā hoahoa, me te ngāwari o te tiaki.
He mea nui te kounga o te mahi toi ki te roa o te ora o te pūnaha. Mā ngā hapa iti pēnei i te turuturu o ngā hononga paipa, te koretake o te teitei o te tuanui, te koretake rānei o ngā putanga wai, ka taea te arahi i te waipuke tonu.
3. Te Whakatūnga me te Whakamātautau Mahi
I mua i te tukunga atu, me whakamātautau te pūnaha kia pai ai te rere o te wai, kia kore ai he rerenga whakamuri, kia kore ai he turuturu, ā, kia tika hoki te mahi a ngā putanga wai ki te hopu i te wai mai i te mata o te rori. I ngā wāhi e pāngia ana e te waipuke tai, he mea nui te whakamātautau i te mahi a ngā kēti waipuke me ngā papu, me te wātea hoki o te hiko tārua.
4. Te Whakahaere me te Tiaki
He maha ngā pūnaha waikeri e kore e ranea, ehara i te mea nā te hoahoa tuatahi kāore i te pai, engari nā te tiaki kore. Ko te para te hoariri matua o te waikeri tāone. Me whakauru ki roto i tētahi kaupapa tiaki pai:
– Te horoi i ngā tomokanga, ngā tāke whakahaere me ngā awaawa i ia wā.
– Te tango paru i ia wā.
– Te kutikuti i ngā otaota i ngā awaawa tuwhera.
– Te tirotiro i te hanganga hei kite i ngā kapiti, te totohu, te neke rānei.
– Pūnaha ripoata a te iwi me te urupare tere ina puta he aukati.
E pā ana hoki te mahi tiaki ki te kāwanatanga: ko wai te kawenga mō ia wāhanga (tāone, kaiwhakawhanake, hapori rānei), me te wātea o tētahi tahua pumau.
Ngā Wero me ngā Aronga Whakawhanake
I te heke mai, me urutau ake te whakamahere waikeri tāone. Ko te tikanga o te huringa āhuarangi, kāore ngā raraunga ua o mua e whakaata i ngā āhuatanga o te heke mai. Nō reira, me whakauru ngā hoahoa i ngā āhuatanga haumaru, ngā āhuatanga ua nui, me te wāhi hei whakawhānui i te kaha. Hei tāpiri, kei te piki haere te hiranga o te ariā o te "tāone hautai": he tāone kua hangaia hei mimiti me te penapena wai mā roto i ngā wāhi matomato, ngā puna wai o te tāone, me ngā mata pūwero.
He au anō hoki te mamati, tae atu ki ngā pūoko taumata wai me ngā pūnaha whakatūpato waipuke wawe e hono ana ki tētahi pokapū whakahaere. Mā ngā raraunga wā-tūturu, ka taea e ngā kaiwhakahaere te whakahaere i ngā mahi horoi, te whakahaere i ngā papu, te kati rānei i ngā kēti waipuke kia tere ake.
Te Katinga
He tukanga maha-mātauranga te whakamahere me te whakatinanatanga o ngā pūnaha waikeri tāone e whakakotahi ana i te wai, te waipēhi, te whakamahere ā-wāhi, te hanga, me te whakahaere. E inehia ana te angitu e te rahi o ngā awa anake, engari e te kaha o te pūnaha ki te whakaiti i te mōrearea waipuke, ki te pupuri i te kounga taiao, me te mahi pono mō te wā roa. Mā te whakakotahi i ngā hanganga hina (ngā awa, ngā paipa wai, ngā papu) me ngā hanganga matomato (ngā pūnaha urunga, ngā wāhi matomato), ka taea e ngā tāone te ātete ake ki te ua nui me te tipu tonu o te tāone. Ina whakamaheretia i runga i ngā raraunga, i hangaia ki te kounga teitei, ā, i tiakina tonutia, he haumitanga nui ngā pūnaha waikeri tāone ki te haumaru me te pumau o te tāone.
