pū kāwhatu mō te kōwhiti wai
Nā ngā pū karehu mō te whakatangitanga pūwai wai e whai take ana i ngā tāngata hiranga i te rōpū kuhaku wai hangarua, ā, e whakatakoto ana hei whakamahere mō te whakapiki i ngā whenua me ngā tahuhu kōhatu kia tae ki ngā puna wai o raro i te whenua. E ai ki ngā whatunga e taea ana te whakawhitiwhiti i ngā momo whenua i roto i te mahi whakatangitanga, ka noho nui ake ngā pū nei i te whakatetonga o ngā pūtahi toki e rua anake hei whakakore i te mate i roto i te mahi whakatangitanga. Kua hangaia ngā pū i runga i te toko rangatira, ā, e āhei ana ki te whakauru i ngā karu tungsten carbide hei whakatika i te whanaketanga me te whakahē i te wehe i te mate. Ka mahi ngā pū i te whakanuitanga rānei, i te whakakore atu rānei, engari kāore i te whakatere i te mahi toki, ko tēnā e pai ana i aua whenua raukura me ngā momo whenua korehua. Ko te hanga e āhei ana ki te whakamahi i ngā ara wai hei whakakore i ngā karehu me te tautoko i te kore rawe i te uruhere pū i waenganui i te mahi. Nō reira, kei raro i ngā whatunga ā-wāhi me ngā whakahaere ā-pū whenua e taea ana e ngā pū karehu ā-mokemoke nei. Kei te whai mana hoki ngā pū nei mō te whakamana i te pūtahi tūpapa me te whakatika i ngā ratonga whakapiki i ngā whenua whai take. E whai pānga ana ngā pū nei ki ngā whakahaere pūwai wai iti me ngā whakahaere kotahi rānei i te rahi, e āhei ana ki te whai i te 100 ki te 1000 pitomita, e hāngai ana ki ngā āhuatanga whenua me ngā take huarahi.