Inoshandiswa kuyedza, kuongorora uye giredhi iyo inoshanduka yekufambisa kuita kwejira mumvura yemvura. Izvo zvinoenderana nekuzivikanwa kwekudzivirira kwemvura, kudzoreredza kwemvura uye kunyura kwemvura hunhu hwemachira echimiro, kusanganisira iyo geometry uye yemukati chimiro chejira uye yakakosha inokwezva maitiro ejira rejira neshinda.
