whakaurunga paipa wai

E anga ana ki te 1,300-putu (mō 396 mita) kaupapa paipa tuku wai, “he aha te diameter hei whiriwhiri” ko te patai matua matua. Ko te kowhiri i te rahi ka kore e rawaka te rere o te wai, ka heke te pehanga ohorere,…