Ko te pūkaha wai rere radial he mea hanga mai i te pūkaha waipēhi me te pūkaha mā te whakamahi i te hononga. Ko te nuinga o te pūkaha waipēhi he mea hanga mai i te volute, te impeller, te pou matua, te hiri me te whakatārewatanga me ētahi atu. I te mea ka arahina te wai pēhanga teitei mā roto i te paipa tomo ki te volute o te pūkaha, ka akiakihia te impeller e te wai kia huri. Ka puta te hiko ina huri te rotor ki te stator.

Kua tāutahia te kaiwhakahaere ngaohiko aunoa (AVR) ki roto i te pūkaha hiko hei whakahaere i te ngaohiko putanga ki te ngaohiko whakatauranga. Kei roto i te pūkaha hiko whakaawe te pūkaha hiko whakaawe momo paraihe me te pūkaha hiko whakaawe momo kore paraihe. Me whakakapi te paraihe o te pūkaha hiko momo paraihe i ia wā. Kua tāutahia he pūnaha whakaawe ki roto i te pūkaha hiko whakaawe; kāore e hiahiatia he taputapu whakaoho ā-waho, he māmā, he ngāwari hoki ki te whakamahi.