Pedzisa mutsara unotevera: Mazhinji emibvunzo iyi akaongororwa zvakare muna 1986 zvichitevera kuferefetwa kwekutadza kwakanyanya kwakafanana kweBureau of Reclamation's Teton Dam munaJune 1976, uye kutadza kwakapotsa kweDhipatimendi reMvura neMagetsi reLower Van Norman Dam muna
Kudengenyeka kwenyika kweSan Fernando muna 1971. Purofesa Ronald Scott weCaltech, uyo akanga apinda muzvidzidzo zveCasagrande, akacherechedza pamusangano wekutevera we1987 paBaldwin Hills kuti Casagrande akanga asina hanya kana kuti akanga asingazivi nezvekufamba kwevhu zvakajeka zvisingabatanidzi nedziva (semuenzaniso avo vari kuStocker-LaBrea) mukuongorora kwake. Mumwe injiniya, Stanley Wilson - uyo akanga ashandawo naCasagrande muzvidzidzo zva1972 uye akatsigira kutaura kwokuti kunyura kwemunda wemafuta kwakanga kuri chikonzero chisina kukosha - zvino akabvuma kuti kuenzanisa kwakafanana kwepasi kwakapararira kunze kwenzvimbo yekuchengetera, kunyanya munzvimbo yeStocker-LaBrea, kuitira kuti nzvimbo yekuchengetera uye zvimwe zvikanganiso zvisingakwanisi kuiswa kune nzvimbo yekuchengetera pachayo - nokudaro kupa mutoro wekukundikana kumabasa emafuta. Nokudaro, mirangariro pamusoro pebasa rokuderera kwenzvimbo yamafuta nokudzorerwazve kwokumanikidzirwa yakaoneka kuva inowirirana.