Geosynthetics February/March 2020 - 20

An innovative erosion control solution using concrete enhanced synthetic turf

FIGURE 7 CEST outfall protection application

the benefit of being a lightweight revetment. Since installation, wetland flooding releases have occurred numerous
times, and each release lasts for a period
of weeks. The CEST has performed very
well under the prolonged constant flow.
A photograph of this structure is shown
in Figure 7.
Summary and conclusion
The CEST system is an innovative revetment technology for use as armoring
protection of hydraulic structures. The
system has been extensively tested for
hydraulic performance and longevity.
The CEST system performance threshold exceeded the maximum facility
capacity at CSU during steady-state and
wave overtopping testing. The system
withstood hydraulic loading at a velocity exceeding 40.5 feet/second (12.2
m/s). During testing in the CSU wave
20

Geosynthetics | February March 2020

overtopping simulator, CEST withstood
13 hours of wave overtopping up to the
maximum discharge of the simulator of
4 cubic feet/second/foot (0.37 m3/s/m)
for a cumulative overtopping volume of
165,600 cubic feet/foot (15,393 m3/m).
This maximum discharge represents a
generic 500-year hurricane (0.2% annual
exceedance probability) in New Orleans,
La. Weathering and longevity evaluations
have been performed on the CEST system. Based on weathering and longevity
evaluations, the projected longevity of
CEST is conservatively estimated to be
50+ years. There are no known reports
of other revetment technologies having undergone such an extensive testing program. Also, there are more than
3,000,000 square feet (280,000 m2) of successful CEST installations. The installations include applications such as levees,
dams, steep downchutes, channels, outfall
structures and shorelines. The CEST has
several benefits over traditional revetment systems. These benefits include
the aesthetics of vegetation, exceptional,
proven hydraulic performance, minimal maintenance, low impact, rapid and
scalable installation, and lower installed
construction cost.

Acknowledgments
The authors would like to acknowledge
and thank the individuals who helped
develop and/or test the innovative CEST
technology. These individuals include
Michael Ayers, Jose Urrutia, Delaney
Lewis, Christopher Thornton, Steven
Hughes and Jason Berg.
References
ASTM D698-12. (2012). "Standard Test Methods for
Laboratory Compaction Characteristics of Soil Using
Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3)." ASTM
International, West Conshohocken, Pa.
ASTM D2859-16. (2016). "Standard Test Method
for Ignition Characteristics of Finished Textile Floor
Covering Materials." ASTM International, West
Conshohocken, Pa.



Geosynthetics February/March 2020

Table of Contents for the Digital Edition of Geosynthetics February/March 2020

Geosynthetics February/March 2020 - Cover1
Geosynthetics February/March 2020 - Cover2
Geosynthetics February/March 2020 - 1
Geosynthetics February/March 2020 - 2
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