Izilawuli zokubhala esihlwayo esisodwa zingamashini amahle ekhetseni ezisebenza emsebenzeni wokwakha nokuhlanjwa. Zisiza abantu ukubhala ngaphezulu kwezinye izinyathelo ukuthola izinkhulumo, amanzi, noma ukwakha izinyathelo ezinzima zokwakha izindlu. Lezi zilawuli zingamandla kakhulu futhi zingathola indlela yokuhamba ngokushesha, ngokwesibonelo sezintonga zokuhamba. Lokhu kusho ukuthi zingasebenza kuzo zonke izinyathelo zomhlaba, na kumaqondolo na kumaqondolo. Isistimu sesihlwayo sisiza ngamandla okubhala kwezinye izinto ezinzima. Izikampani njenge-Mazellion ziyakwenza lezi zilawuli, ukuthi zibe yisikhathi eside futhi zisebenze ngokwanele.
Amadrigi wezindlela zokubhula ezingaphansi zokubhula ngamandla angu-hydraulic ayingakanani kubalulekile kwezindlela zokwakha kusasa. Kungakhulisa izihlangothi eziningi kumhlaba, okunconywa ngendlela eyodwa. Okokuqala, lezi drigi zingabi nesibindi futhi zingakhulisa umsebenzi omkhulu. Lokhu kwenza kuzo zizindilinga zokwakha izindlu ezide, amazwe, nezindlu zokugcina. Kungakhulisa ngaphansi kwemithi yezinkundla nezintfu, futhi kufika emaphakathini aphakathi kwezinye izimboni. Isibonelo, lapho abawakhi badinga ukufaka izindlinga ezide zokwakha izindlu zezinkundla, lezi drigi zingabikho. Ukusebenzisa lokho okuhlanganise Amaphathi Okudlula kungahlela kakhulu umsebenzi wokubhula.