Case Study - Taum Sauk Dam Failure

What was the primary cause of the Taum Sauk dam failure described in the video?

• A sudden earthquake in the region

• Overtopping of the parapet wall and erosion of the rockfill embankment

• Structural fatigue affecting the concrete panels

• A malfunction occurring in the hydroelectric plant's turbines

What is the main purpose of a pumped storage facility like the Taum Sauk plant?

• To generate a steady supply of electricity for base-load needs.

• To store surplus electricity from other sources and release it during periods of high demand.

• To supply water for irrigation to surrounding farmland.

• To act as the main provider of electricity for a metropolitan area.

In the equation for power generated by falling water (P = g · ρ · Q · h), which two factors can engineers mainly modify to reach a desired power output?

• Gravitational acceleration (g) and density (ρ)

• Density (ρ) and flow rate (Q)

• Flow rate (Q) and height difference (h)

• Gravitational acceleration (g) and height difference (h)

Why were concrete panels installed along the inside of the Taum Sauk reservoir's rockfill embankment?

• To provide additional strength to the embankment structure.

• To prevent water loss through the porous rockfill material.

• To make the embankment watertight, as rockfill alone is porous.

• To enhance the visual appearance of the reservoir area.

How did the deregulation of electric power markets in the 1990s impact the operation of the Taum Sauk plant?

• It led to a reduction in the plant's overall output.

• It caused the plant to operate less often, reducing maintenance needs.

• It increased the plant's operational frequency, often cycling twice daily.

• It resulted in the plant being switched to a different energy source.

What significant repair was implemented in 2004 to address leakage in the reservoir?

• Construction of small ponds to capture leakage

• Installation of a geomembrane liner

• Reinforcement of the reservoir walls with concrete panels

• Pumping captured leakage back into the reservoir

Which organization recognized the Taum Sauk Pumped-Storage Electric Power Plant as an engineering milestone?

• Federal Energy Regulatory Commission (FERC)

• Army Corps of Engineers

• Institute of Electrical and Electronics Engineers (IEEE)

• Missouri Department of Natural Resources (DNR)

What was a major flaw in the design of the level sensor mounting system after the geomembrane liner was installed?

• The sensors were mounted directly to the concrete, which led to water ingress

• The cables used for mounting were not long enough to reach the control panel

• The conduits for the sensors were buoyant and were affected by strong water currents

• The anchors at the top and bottom of the embankment slope did not provide adequate stability

How did operators attempt to adjust the control system after discovering the level sensors were providing inaccurate readings?

• They physically repositioned the sensors to correct the readings

• They reprogrammed the system to subtract 2 feet from the upper set point

• They replaced the sensors with new ones to improve accuracy

• They changed the plant operation mode to manual control

What fundamental design element was missing from the Taum Sauk reservoir, which contributed to the disaster?

• A reinforced geomembrane liner

• Adequate rockfill in the embankment

• A spillway to safely release excess water

• Properly calibrated level sensors