underground estuary

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.


This project is supported by the National Science Foundation under Grant No. ESI-0104478. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the National Science Foundation.