Abstract — Vetiver grass (Chrysopogon spp.) is characterized by creating a dense hedge that acts as a barrier against rainwater runoff. The barrier significantly reduces the runoff velocity that enables the sediment contents of the runoff to be deposited behind the hedge depending on the slope of the land that creates terraces over time. This case study aims to review the characteristics of the vetiver roots and evaluate its effectiveness in protecting unstable slopes. Field trials were conducted in selected mining areas in Papua New Guinea using quality planting materials and fertilizers for rapid growth and a very immense network of roots formed in the soil. Its root average tensile strength of 75 MPa or approximately 1/6th of mild steel, higher than several trees traditionally used for steep slope stabilization. Vetiver grass is tolerant to drought, saline soil, high and low temperature, thus it lives longer. The effectiveness of Vetiver System Technology is presented in this case study on very unstable sites in Papua New Guinea.
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