Mō ngā wāhi kaukau, he mea nui te mārama ki te tere o te rere o te wai kia pai ai te kaukau. Me ruku tātou ki te tātaitanga mā te whakamahi i te puna kaukau FSPA 12*3.2 – mita hei tauira.
Ko te tere rere o te wai i roto i te puna kaukau ka whakatauhia e tētahi tātai māmā engari whai hua: ko te horahanga o te putanga kaukau mutunga kore ka whakareatia ki te tere rere i whakamatautauria, kātahi ka whakareatia ki te maha o ngā hēkona i roto i te hāora. Mō te puna kaukau FSPA, ko te roa o te putanga he 780mm (0.78m) me te whānui he 370mm (0.37m). Ko te tere rere i whakamatautauria he 2m/s.
Tuatahi, ka tatauhia e tātou te horahanga o te putanga, arā, 0.78m * 0.37m = 0.2886m². Kātahi, ka whakareatia tēnei horahanga mā te tere rere (2m/s) me te maha o ngā hēkona i roto i te hāora (3600s). Nō reira, 0.2886m² * 2m/s * 3600s = 2088m³/h.
He mea nui tēnei tataunga nā te mea ka homai he whakaaro ki a tātou mō te kaha me te kaha o te ia wai i roto i te wāhi kaukau. Ko te tere rere teitei ake ko te tikanga he ia kaha ake, he mea tino pai mō te kaukau tawhiti, mō ngā mahi whakangungu uaua ake rānei. Mā te tere rere kua tatauhia o te puna kaukau FSPA, ka taea e ngā kauhoe te pārekareka ki tētahi wheako kaukau tonu, kāore e mutu, pērā i te kaukau i roto i te moana mutunga kore.
Nō reira, ā te wā e whakaaro ana koe ki tētahi wāhi kaukau, kia maumahara ki te hiranga o te tatau i te tere rere o te wai kia kitea ai te mea tino tika mō ō hiahia.