▁feet ▁per ▁second . ▁It ▁has ▁a ▁ 2 ▁percent ▁chance ▁of ▁reaching ▁ 1 0 , 9 0 0 ▁cub ic ▁feet ▁per ▁second ▁and ▁a ▁ 1 ▁percent ▁chance ▁of ▁reaching ▁ 1 4 , 7 0 0 ▁cub ic ▁feet ▁per ▁second . ▁The ▁peak ▁annual ▁dis charge ▁has ▁a ▁ 0 . 2 ▁percent ▁chance ▁of ▁reaching ▁ 2 9 , 5 0 0 ▁cub ic ▁feet ▁per ▁second . ▁ ▁The ▁concentration ▁of ▁dissol ved ▁o xygen ▁in ▁Spring ▁Brook ▁at ▁the ▁community ▁of ▁Spring ▁Brook ▁was ▁measured ▁to ▁be ▁ 1 0 . 6 ▁mill igr ams ▁per ▁liter ▁in ▁ 1 9 7 5 . ▁The ▁concentration ▁of ▁hydro gen ▁ ions ▁was ▁measured ▁to ▁range ▁from ▁ 0 . 0 0 0 1 3 ▁to ▁ 0 . 0 0 0 4 0 ▁mill igr ams ▁per ▁liter ▁in ▁the ▁ 1 9 7 0 s . ▁The ▁concentration ▁of ▁carbon ▁dio x ide ▁r anged ▁from ▁ 2 . 2 ▁to ▁ 6 . 2 ▁mill igr ams ▁per ▁liter ▁and ▁the ▁b ic ar bon ate ▁concentration ▁r anged ▁from ▁ 9 ▁to ▁ 1 2 ▁mill igr ams ▁per ▁liter . ▁The ▁sul f ate ▁concentration ▁in ▁Spring ▁Brook ▁r anged ▁from ▁ 1 2 . 0 ▁to ▁ 1 9 . 0 ▁mill igr ams ▁per ▁liter . ▁The ▁ch lor ide ▁concentration ▁r anged ▁between ▁ 3 . 7 ▁and ▁ 8 . 0 ▁mill igr ams ▁per ▁liter .