Underground Construction - May 2020 - 32

Corrugated Pipe Provides Path
for Increased Hydro-Electric Power
Isolated Alaska Project Takes Industry Honor
Instead of letting melting snow ﬂow into the ocean, a plan
was developed to utilize the water to increase the output of a
hydropower plant in Kodiak, Alaska, by 33 million kilowatt-hours
a year. To do this, a 1.2-mile-long, 11-foot-diameter tunnel is
being bored through a mountain to connect the Upper Hidden
Basin Creek and Terror Lake.
For diverting snowmelt ﬂowing from the upper mountains
and into the tunnel, nearly a mile of corrugated high-density
polyethylene (HDPE) pipe is being used. HDPE double-wall pipe is
highly eﬃcient due to the low friction factor of its smooth interior,
resulting in optimum hydraulic ﬂow design.
Kodiak Island is not connected to the North American power
grid, so renewable energy sources are critically important and
highly desired in order to minimize environmental impact. The
increased capacity resulting from the Terror Lake Upper Hidden
32

MAY 2020 | UConOnline.com

Basin Diversion project represents an equivalent of $4.6 million
worth of annual diesel generation, which equates to reduction of
approximately 530 tons of NOx and 26,000 tons of greenhouse
gas into the atmosphere.
Due to the remote location, the contractor recommended the
HDPE corrugated dual-wall pipe with watertight bell and spigot ends
including gaskets. The project also used HDPE corrugated single-wall
pipe, ﬁttings, couplers and HDPE ﬂared end sections. In total, the
project consisted of 5,160 linear feet of corrugated HDPE pipe.

Honor
The Kodiak undertaking was named Project of the Year in the
Plastics Pipe Institute's (PPI) Drainage Division for HDPE pipe
supplier and PPI member, Paciﬁc Corrugated Pipe Company
(Newport Beach, Calif.).

http://www.UConOnline.com

Underground Construction - May 2020

Table of Contents for the Digital Edition of Underground Construction - May 2020

Contents
Underground Construction - May 2020 - FC
Underground Construction - May 2020 - IFC
Underground Construction - May 2020 - Contents
Underground Construction - May 2020 - 4
Underground Construction - May 2020 - 5
Underground Construction - May 2020 - 6
Underground Construction - May 2020 - 7
Underground Construction - May 2020 - 8
Underground Construction - May 2020 - 9
Underground Construction - May 2020 - 10
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Underground Construction - May 2020 - IBC
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