▁coal ▁per ▁ton ▁of ▁steel ▁produced ▁from ▁four ▁tons ▁in ▁ 1 9 2 0 ▁to ▁ 1 . 5 8 ▁in ▁ 1 9 3 3 . ▁Much ▁of ▁the ▁iron ▁ore ▁was ▁from ▁China ▁and ▁Korea . ▁To ▁supply ▁the ▁energy ▁to ▁the ▁Ste el works ▁a ▁large ▁dam ▁was ▁created . ▁ ▁The ▁fact ories ▁covered ▁many ▁acres ▁and ▁a ▁town ▁spr ang ▁up ▁nearby , ▁Y ah ata , ▁Fu ku oka ▁to ▁supply ▁the ▁workers . ▁ ▁Dam ▁break ▁On ▁May ▁ 1 , ▁ 1 9 1 6 , ▁American ▁media ▁reported ▁that ▁the ▁" Gre at ▁Dam " ▁at ▁the ▁Y aw ata ▁Ste el ▁Works ▁had ▁col lapsed ▁and ▁completely ▁sub mer ged ▁a ▁section ▁of ▁the ▁manufact uring ▁city . ▁Initial ▁reports ▁stated ▁that ▁hundreds ▁of ▁people ▁were ▁killed ▁and ▁thousands ▁made ▁hom eless . ▁ ▁They ▁army ▁was ▁sent ▁in ▁to ▁help ▁with ▁the ▁recovery . ▁ ▁See ▁also ▁K aw achi ▁Dam ▁finished ▁ 1 9 2 7 ▁Ab ur agi ▁Dam ▁finished ▁ 1 9 7 1 ▁ ▁Bibli ography ▁ ▁Notes ▁ ▁References ▁▁▁ ▁- ▁Total ▁pages : ▁ 3 2 4 ▁▁▁▁▁ ▁Category : D ams ▁in ▁Fu ku oka ▁Pref ect ure ▁ ▁Category : D am ▁fail ures ▁▁ ▁Category : Man - made ▁dis aster s ▁in ▁Japan <0x0A> </s> ▁Graph ane ▁is ▁a ▁two - dimensional ▁polym er ▁of ▁carbon ▁and ▁hydro gen ▁with ▁the ▁formula ▁unit ▁( CH ) n ▁where ▁n ▁is ▁large