He mea hanga mā te whakamahi i te hangarau wai-tuaka maha, ka tapahia ia wahi ki te taumata tika o te maikorona, kia taea ai te hanga hononga piripono, kia kore ai e puta ngā āputa, kia mau tonu ai hoki te pumau mō te wā roa. Ka whakarei ake te āhua kanapa o te kōhatu i te āhua o te kōhatu, ka hangaia he rere tirohanga matatau e pai ana mō ngā whare hou me ngā whare tuku iho.
