rōrahi Tātaitanga o te wai i roto i te ipu tapawhā
Whakapūtātia āhuatanga i roto i te mitamano
X - te whanui o te ipu
Y - teitei tank
L - roa ipu
H - taumata inu
Ka tātai i te hōtaka i te rōrahi o te wai i roto i te tank tapawhā, katoa, me te free rōrahi, ngā wāhi mata.