A new type of levee is taking root in Northern California

The Bay's newest flood defense sits at the Palo Alto Baylands Nature Preserve — but you might mistake it for a garden. Per Grist, it's a horizontal levee, planted with over thirty-five native species. Unlike traditional levees with steep concrete faces, this one slopes gradually, letting waves break on it like they would on a beach. What makes it genuinely innovative is what's buried beneath: treated wastewater from the Palo Alto treatment plant irrigates the plants, which filter out excess nitrogen before the water seeps into the Bay. The gentle slope also restores habitat for endangered salt-marsh harvest mice. Researchers will monitor the site over five years to prove these green-infrastructure levees can work — vital as sea levels along the Bay are projected to rise three to six feet by twenty one hundred.

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