He tikanga whakarite hoki tēnei mō te whakatau i te whakapae tika, ā, heoi nei te kawe wai noa iho, inā he pūtauaka whakamahana. He pai tēnei hei whakatakoto i ngā taumata wai e hiahiatia ana hei whakamārama i ngā whatunga o ngā pūtauaka whakamahana. Mēnā e mōhio ana te hanganga o ngā pūtauaka nei, ka taea te whakatū i ngā rautaki whakawhitiwhiti pai ake. Kua hangaia ēnei kawe wai kia ea ai te mahi, kāore he raru nui rānei i te kitea i ngā hokohoko e mahia ana e ngā toa moemoeā.