What is the most effective but also most expensive landuse p

What is the most effective, but also most expensive land-use planning tool? Why is it so effective?

Solution

Moving structures or a system out of harm’s way through property acquisition or relocation is the most effective, but also most expensive land-use planning tool. This is a tool which helps numerous communities working with their citizens to voluntarily agree to be moved out of harm in case of significant or repetitive flooding. Hence, this is effective because it doesn\'t force people during mitigation.