By a quiet picnic area in the Presidio, water gurgles out of the hillside, spills over brick walls, and disappears underground on its way north to Crissy Field and the Bay. This is El Polin Springs, celebrated by the Ohlone and the Spanish for bringing fertility to anyone who drank of it. Ambitious plans to uncover the watershed’s stream channels are peeling back interwoven layers of human and natural history to reveal a complete urban watershed.
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