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Medina dam is a 160-foot-high concrete dam that was built in 1912 for irrigation.  Givler Engineering served as a sub-consultant to another engineering firm to develop and to oversee a plan to clear the relief wells and to replace valves on the outlet conduits.   This view shows the downstream face of the dam.  The relief wells are located inside the dam and are accessible from the inspection gallery.  The outlet conduits are located beyond the large trees in the center of the photograph.

The inspection gallery is accessed by two entrances at the toe of the dam.  One of the entrances is shown here.

This is the inspection gallery.  Relief wells extend up to 40-feet below the floor of the inspection gallery.  The wells prevent pressure from building up in the foundation, thereby contributing to the stability of the dam.

This photograph shows a high-pressure water hose being inserted into a relief well.  The water-jet dislodged sediment and calcium carbonate buildup.

 This view is from the top of the dam.  It shows where the three 60-inch outlet conduits discharge.  Operators for the outlet valves can be seen on the wooden structure.

 This is a close up view of one of the valve operators.  The three original gate valves, stamped “1895”, were still used to throttle discharge from the reservoir in 2002.  The valves are scheduled to be replaced soon.

 This is the bonnet for one of the existing 60-inch gate valves.

 Discharge from one of the 60-inch conduits.

 Discharge from the conduits is received by a concrete tailrace at the base of the limestone cliff.

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Last modified: January 21, 2009