Without question, Dutch innovations in water management have made the Netherlands a more secure nation. But one of these innovations, the Afsluitdijk, created an impassable, 20-mile-long barrier for migratory fish, harming the local marine life. An ecosystem that hobbles is less secure.

So Dutch water management experts responded by building the Fish Migration River through the Afsluitdijk to reconnect the Wadden Sea and the IJsselmeer, allowing many species of migratory fish to reach their mating and living areas again.