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Consider future events, increase redundancy

Levees and hill dams will provide very little protection if their construction only takes into account historic data. Structural devices can provide protection only up to a certain level. For high-intensity events, structures can actually increase risk by providing a false sense of security. Protection structures in isolation (i.e., without redundancy) can be overwhelmed and fail catastrophically. Poor management, siltation and degradation will quickly render structures obsolete. Planning needs to take into account not only average events, but also those with a higher return period: one-in-40 years and one-in-100 years.

PERC Reports