Geocell-Reinforced Hard Armor for Channels: Hydraulic Test Results for GEOWEB Infilled with Concrete For the tests including concrete infill, it was confirmed that the established performance threshold had not been exceeded, even for the highest flows capable of being delivered to the CSU test flume. It was determined that a system comprised of GEOWEB 30V3 geocells infilled with 3000-psi concrete exhibited the capability to withstand sustained flow velocities of 35.7 ft/sec and shear stresses of 20.9 psf. Stability at severe hydraulic conditions indicates that GEOWEB with concrete can reasonably be expected to perform well in most engineering applications where shear stresses are generally much lower than the maximum level observed in the test simulations. A Customizable Solution for Channel Protection The GEOWEB Channel Protection System provides a cost-effective and sustainable solution for the construction of stormwater channels that can be customized to meet a wide range of hydraulic conditions to meet your project-specific needs. The GEOWEB Channel Protection System allows for permeable infill options such as vegetation or aggregate, promoting effective stormwater management and infiltration, while reducing the risk of flooding, or concrete infill, as a hard armor option to protect against scour and extreme flow events. With its flexible design and permeable infill options, the GEOWEB System is an innovative solution that can help communities establish resilient urban infrastructure that can withstand the impact of natural disasters, extreme weather events, and changing climate patterns.
Aggregate Channel Lining: Hydraulic Test Results for GEOWEB Infilled with Coarse Gravel, Small Cobbles Using data collected from 90 tests, the GEOWEB Channel Protection System with aggregate infill was evaluated on its performance as compared to rip-rap. Results showed that the required rock size for aggregate fill was at least 30 percent smaller than rip-rap as sized by Abt and Johnson (1991) and at least 50 percent smaller than sizes recommended by the Army Corps of Engineers (1994). The ability to reduce rock size highlights the potential to use GEOWEB Channel Protection System as a value engineering alternative to rip rap, especially in areas where larger rock is not locally available.
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Additional Information Hydraulic Performance Test Summary: GEOWEB® for Vegetated Channel Protection Hydraulic Performance Test Summary: GEOWEB® for Aggregate-Based Channel Protection Hydraulic Performance Test Summary: GEOWEB®-Reinforced Hard Armor for Channels
References Abt, S.R. and Johnson, T.L. (1991). Riprap design for overtopping flow. ASCE Hydr. Engr., 117(8):959-972. United States Army Corps of Engineers (USACE) (1994). Hydraulic Design of Flood Control Channels, Engineering Manual No. 1110-2-1601 (revised), Washington D.C.
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June 2023 csengineermag.com
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