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New Creek Site 14 Dam

Dam rehabilitation establishes long-term, sustainable water supply. 
  • New Creek Site 14 Dam and spillway rehabilitation improved water quality and supply for citizens of Keyser-Gannett Fleming

    Dam and spillway rehabilitation improved water quality and supply for the citizens of Keyser.

  • New toe drain installation at New Creek Site 14 Dam-Gannett Fleming

    New toe drain installation at New Creek Site 14 Dam.

Client
U.S. Department of Agriculture Natural Resources Conservation Service, West Virginia State Office

Location
Keyser, West Virginia

Our Role
Investigations, Surveying, Seepage and Stability Analyses, Hydrologic and Hydraulic Modeling, Structural Analyses, Materials Investigations, RCC Mix Design, Design, Construction Management.

Data
Size
114-foot-high by 940-foot-long earthfill dam
Construction Cost
$10 million
Completed
2012
Type
Rehabilitation
Duration
2 year 6 months
Outcomes
  • Flood protection and a reliable water supply
  • Compliance with current design and performance standards
  • Extending the dam’s lifespan by another 50 years.

For the citizens of Keyser, the New Creek Site 14 Dam is a critical water resource, providing flood control, a dependable source of municipal water, and recreational areas. But time had taken its toll on the 1963 structure, demanding action to bring the watershed dam up to current safety standards.

Rehabilitation included replacement of the reinforced concrete principal spillway/intake structure, realignment and reinforcement of the auxiliary spillway utilizing roller compacted concrete, installation of a downstream toe and chimney drainage system, and flattening of the upstream and downstream slopes. A portion of the work was funded through the 2009 American Recovery and Reinvestment Act; the remainder was provided by a local sponsor.

What We Did

To rehabilitate the 114-foot-high, 940-foot-long earthfill dam, our work included field investigations, including bathymetric and field surveys, mapping, embankment and conduit inspections; geotechnical subsurface investigations; and installation of piezometers and data loggers. We also performed geophysical surveys, including a self-potential survey to identify seepage and a seismic refraction survey to identify top of rock and bedrock seismic velocities, as well as embankment seepage and stability analyses to improve long-term reliability. Our hydrologic and hydraulic studies were done to evaluate the spillway capacity.
 
We also completed conceptual and final design of the new roller-compacted concrete (RCC) auxiliary spillway. Plans were made to stabilize the embankment slope and improve drainage. We likewise designed the new 80-foot-high concrete principal spillway/intake structure and outlet conduit connection and prepared the design report, drawing and specifications, and construction cost estimates.

Key Features

  • New roller-compacted concrete auxiliary spillway and stilling basin
  • New principal spillway/water intake structure and conduit extension
  • Flattened embankment slopes
  • Construction of principal spillway plunge pool
  • New embankment internal drainage system.  

Sustainability Features & Outcomes

  • Ground-granulated blast furnace slag, a byproduct of the steel manufacturing industry, was used to replace 42.5 percent of the cement in all conventional concrete
  • Fly ash, a byproduct of coal-fired power generation, replaced 50 percent of the cement in all roller-compacted concrete; using these recycled materials decreased the Portland cement usage by approximately 2,850 tons, which directly resulted in a reduction of nearly 2,850 tons of CO2 emissions and eliminated the need to landfill the by‐products
  • Concrete from the old riser structure was recycled, and the excavated materials from the expanded auxiliary spillway were used to improve stability of the upstream and downstream embankment slopes.

Similar Projects: Water/Wastewater: Dams & Levees, Dams & Levees: Dams Investigation & Design, Engineering, Federal, Dams & Levees: Planning, Federal: Water Resources, Water/Wastewater, Engineering: Water/Wastewater