Kana zvasvika kune nyika yezvivakwa, pane zvakawanda zvinotariswa zvinofanirwa kutariswa. Kubva kumigwagwa nemigwagwa mikuru kuenda kumasuweji nemadhiraini, chikamu chimwe nechimwe chine basa rakakosha kuchengetedza kushanda nekuchengetedzwa kwemaguta nemadhorobha edu.
Chimwe chinhu chakadaro chinowanzo furatirwa asi chakanyanya kukosha chivharo chegomba. Mavhavha emugodhi akakosha pakupa mukana wekushandisa pasi pevhu, sepombi dzesuweji, waya dzemagetsi, uye tambo dzenhare. Izvo hazvingobvumiri kugadzirisa nyore uye kugadzirisa asiwo zvinoshanda sechivharo chekudzivirira, kudzivirira tsaona kana kupinda kusina mvumo.
Mumakore achangopfuura, kwave nekuchinja kwekushandisa ductile iron manhole mavhavha nekuda kwekunaka kwavo kwakasiyana pane zvimwe zvinhu. Ichi chinyorwa chichaongorora kuti sei ductile iron manhole inovhara iri mhinduro yakakwana yemapurojekiti ezvivakwa.