Ramba uchinyora ndima iyi - Somunjiniya weCalifornia State, Hall akashanda panogadzirwa gadziriro yakazara yokugovera mvura uye kudzora mafashamo eSacramento Valley. Kudzidza kwaHall kweCalifornia hydrology kwakatora kubva muna 1878 kusvika muna 1883. Panguva iyoyo, vashandi vake vakagadza gadziriro huru yokuyera kuyerera kwenzizi dzomuCalifornia. Akabatsirawo pakugadzira mapurojekiti okubatsira San Francisco kuwana mvura yakakwana kubva kumvura yokumadokero yeRwizi rweTuolumne. Pashure pokudengenyeka kwenyika kwa1906
, San Francisco akakwanisa kuchengetedza kodzero dzemvura, uye yakafukidza Hetch Hetchy Valley.