Brackish

“On one of the Netherlands’ northernmost islands, windswept Texel (pronounced Tessel) surrounded by encroaching ocean and salt marshes that seep sea water under its dykes and into ditches and canals, an enterprising farmer has taken the radical step of embracing salt water” and producing a salt-tolerant potato. (http://www.theguardian.com/science/2014/oct/18/humble-potato-poised-to-launch-food-revolution)

Ready salted.

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Floats

Miami Beach is “retrofitting 300 outflow valves that allow stormwater to drain into the bay, inserting plugs to prevent the reverse flow of sea water. Dunes are being reinforced with sea oats and engineers are looking into pumping water into underground storage.” (http://uk.reuters.com/article/2014/10/03/us-usa-miami-beach-flooding-idUKKCN0HS0U820141003)

Porridge has long been known to be as effective as concrete.