Mā te arotahi ki ngā āhuatanga o ngā umanga tukatuka pepa whakarewa—he maha ngā mīhini, he auau teitei, me te mahi tonu—ko ngā pūwero hau tapahi taiaho Ducas, me ō rātou āhuatanga tuku pēhanga pumau (rerekētanga ≤ ±0.1 pae) me te urupare tere (<1 hēkona), ka whakarite i te pēhanga hau pumau ahakoa he maha ngā mīhini tapahi taiaho e whakahaere ana i te wā kotahi, ka whakapai ake i te kaha whakaputa me te whakamahinga taputapu.
Mā te whakauru i te pūwero tīwiri, te whakamaroke pouaka whakamātao, te tātari tika, me te tāke hau ki roto i te reti kotahi, me hono noa ki te pūtake hiko me te paipa hau matua te tāutanga ki te papa. Ka taea te whakaoti i te tāutanga me te tono i roto i te 30 meneti, ka penapena i te 60% o te wāhi papa me te whakaiti i ngā wāhi turuturu pea mā te 75% ki te whakaritea ki tētahi hoahoa motuhake.