---Total lifetime design Construction+maintenance+Remove "law of fives"in maintenance 1 spent in Phase A for protection (construction) 三 saving 5 repair expenditure in Phase B(10Y) 三 saving 25 repair expenditure in Phase C(20Y) 二 saving 125 S repair expenditure in Phase D(30Y)---Total lifetime design Construction+ Maintenance+ Remove “law of fives” in maintenance 1 $ spent in Phase A for protection (construction) = saving 5 $ repair expenditure in Phase B(10Y) = saving 25 $ repair expenditure in Phase C(20Y) = saving 125 $ repair expenditure in Phase D(30Y)