Geosynthetics April/May 2020 - 36
CSPE performance and history in long-term potable water storage applications
On the operations side, an important
factor is the need for regular inspections and preventative maintenance of
the cover systems, recommended on an
annual basis.
In the following section, we highlight three projects where CSPE liners
and floating covers have been used in
longer-term applications in hot, dry climates for municipal potable water storage. The profiles help to demonstrate
the unique weathering ability of CSPE
to withstand the elements of time, temperature, UV exposure and chemicals
used for water disinfectant.
Hinkle Reservoir
* San Juan Water District
* Granite Bay, Calif.
* 62-million-gallon
(235-million-l) capacity
* Potable water storage
* CSPE liner and cover installed
in 1980
FIGURE 3 Hinkle Reservoir 37-year-old
CSPE floating cover in 2017
36
The San Juan Water District's Hinkle
Reservoir had a 45-mil (1.1-mm) CSPE
liner and floating cover installed in 1980.
The cover has a defined sump design with
the flotation system installed on the bottom side of the cover. The water district
initially chose an open-top reservoir with
a floating cover based on the substantial
cost savings versus other storage options.
When the reservoir was initially reconstructed, alternatives such as steel and
concrete tanks were considered. Since
this was a municipal facility, both cost
and performance were equally considered in the determination of the storage
facility. It was determined at the time
that the cost of a CSPE liner and floating
cover system was approximately 60% to
80% less than alternative storage systems
considered (Figure 3). This also factored
in life-cycle costs for maintenance and
servicing. As a result, CSPE was specified
and the material was designed, fabricated and installed as one of the firstgeneration larger-scale floating covers.
Fully extended, the floating cover spans
14 acres (5.7 ha). The Hinkle Reservoir
is located northeast of Sacramento, Calif.
The region is known for its hot, arid summers and high UV exposure. The winters
are typically a bit cooler, wet and partly
cloudy. Over the course of the year, average temperatures can vary from 35°F to
104°F (2°C to 40°C).
In 2016, when the CSPE material
reached the 36-year mark, the material
was tested by the manufacturer, with the
results shown below in Figure 5. The
material's tensile strengths and tensile
elongation properties were shown to be
above the original published material
specifications. Further independent
third-party testing was conducted by the
water district. The reservoir is currently
scheduled to have a new liner and cover
installed over the next couple of years. At
that time, the original installed liner and
cover materials will have been in service
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Geosynthetics April/May 2020
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