Arch dam near a big city

Type: Arch dam
Material: Concrete
Location: Five miles from big city
Age: 10 years
Purpose: To provide electric power to a large city; to prevent flooding
Problem: Big crack
Budget: $200 million

The Opinions:
"You can't take our dam down! The turbines in our dam generate enough hydroelectric power to serve 1.3 million people! Without this dam, the entire city would go dark!"
-- Mayor of big city

"You've got a real problem on your hands. This dam is going to burst any second, and there are over a million people living just five miles away. If you don't take this dam down or repair it real soon, the entire city will be underwater."
-- Dam safety official