March 29, 2015

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Two Articles by Geosyntec Practitioners Featured in Geostrata Magazine

In Geostrata's March/April issue, two articles authored by Geosyntec Practitioner's were featured, "Geotextile Tube Dewatering" by Senior Engineer Ming Zhu, Ph.D., P.E., and Principal Jay Beech, Ph.D., P.E., (Kennesaw) and "Very Long-Term Care of Mechanically Stabilized Earth Berms: Limiting the Liability of Future Stakeholders" by David Espinoza, Ph.D., P.E., and Jeremy Morris, Ph.D., P.E., (Columbia).

Ming and Jay explain geotextile tube dewatering, its benefits, and several design considerations when using geotextile tubes. They describe in detail the need for site investigation programs, geotechnical engineering analysis, and geotechnical performance monitoring, including a case study on the Savanna Street Wastewater Treatment Plant in Jackson, MS that processed 92,000 dry tons of biosolids sludge through the use of geotextile tubes.

In their article, David and Jeremy address the post-operational performance and care of mechanically stabilized earth  berms used in construction of waste containment facilities, using as an example a municipal solid waste landfill. They explain the technical considerations and risk associated with very long-term (VLT) care and estimate possible funding shortcomings and also introduce a method for valuing long-term infrastructure investments, termed "decoupled net present value" (DNPV). DNPV, an alternative method to NPV, which they have developed over the past several years, separates risk from the time value of money, facilitating evaluation of the effect of each source of technical risk (e.g., storm, earthquake) and market risk at different times. Using DNPV analysis, each identified risk is considered as a separate cost to the project. Each cost conceptually equivalent to the price of a self-insurance policy against that risk. 

For access to the March/April issue of Geostrata Magazine, click here (membership required)

For more information, please contact Ming Zhu (This email address is being protected from spambots. You need JavaScript enabled to view it.) and Jay Beech ( This email address is being protected from spambots. You need JavaScript enabled to view it.) in Kennesaw (+1-678-202-9500), Georgia, or David Espinoza ( This email address is being protected from spambots. You need JavaScript enabled to view it.) and Jeremy Morris (This email address is being protected from spambots. You need JavaScript enabled to view it.) in Columbia, Maryland (+1-410-381-4333).