Case study of a full-scale evapotranspiration cover

Journal of Geotechnical and Geoenvironmental Engineering
By: , and 

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Abstract

The design, construction, and performance analyses of a 6.1ha evapotranspiration (ET) landfill cover at the semiarid U.S. Army Fort Carson site, near Colorado Springs, Colo. are presented. Initial water-balance model simulations, using literature reported soil hydraulic data, aided selection of borrow-source soil type(s) that resulted in predictions of negligible annual drainage (⩽1mm∕year). Final construction design was based on refined water-balance simulations using laboratory determined soil hydraulic values from borrow area natural soil horizons that were described with USDA soil classification methods. Cover design components included a 122cm thick clay loam (USDA), compaction ⩽80% of the standard Proctor maximum dry density (dry bulk density ∼1.3Mg/m3), erosion control measures, top soil amended with biosolids, and seeding with native grasses. Favorable hydrologic performance for a 5year period was documented by lysimeter-measured and Richards’-based calculations of annual drainage that were all <0.4mm∕year. Water potential data suggest that ET removed water that infiltrated the cover and contributed to a persistent driving force for upward flow and removal of water from below the base of the cover.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Case study of a full-scale evapotranspiration cover
Series title Journal of Geotechnical and Geoenvironmental Engineering
DOI 10.1061/(ASCE)1090-0241(2009)135:3(316)
Volume 135
Issue 3
Year Published 2009
Language English
Publisher ASCE
Contributing office(s) Nevada Water Science Center, Toxic Substances Hydrology Program
Description 17 p.
First page 316
Last page 332