The cure for winter flooding might be in this swamp — if California actually funds it

Matt Kaminski stood on a road scarcely higher than the floodplain, glassy pools on all sides stretched out like something from a dream. In the distance, a storm lumbered over the Coast Ranges. The marsh all around him, Kaminski said, was a window into the Central Valley’s past. Back then, the waterways that twist down from the Sierra Nevada mountains would flood unrestricted by the current thicket of dams, canals and levees. The more you know about rivers, the less confidence you have in a mapmaker’s static squiggle. Kaminski, a biologist from Ducks Unlimited who helps oversee the floodplain a...