Kammala jumla mai zuwa: A cikin 1970s, Hourani ya fara amfani da simintin da aka riga aka ƙaddara don aiwatar da slabs a kan matakin da ganuwar riƙewa. A shekara ta 2002 Hourani ya mallaki tagogin tagogi da aka tsara don tsayayya da guguwa ta rukuni na 4 da 5; ya kuma tsara fasahar mallakar fasaha don mai tsabtace mai da aka yi wahayi zuwa ta hanyar
1989 Exxon Valdez oil spill bala'i a Alaska, da kuma 2010 Deepwater Horizon mai zuba a cikin Gulf of Mexico.