underground estuary
exhibit
upper fort mason
Underground Estuary reveals periodic fluctuations in the groundwater beneath Fort Mason. The ebb and flow of the tides is a primary factor in changing underground water levels near the Bay. Built over a 25-foot-deep well, the exhibit’s water column moves up and down in synchrony with the groundwater’s rise and fall; a float in the water column drives a chart recorder recording the past month’s groundwater levels.
