This paper describes the SOTREDI project, 'Soil TREatment for Dikes', undertaken by Lhoist Group, a lime producer, since 2005. This project was led in partnership with research centres and universities, and presents new perspectives for the use of soils in hydraulic context. The objective was to demonstrate that soil treatment with lime, besides enhancing the materials workability, confers high levels of mechanical properties and low permeability values. Lime-treated soils also offer a reduction of piping and internal erosion hazards, and significantly increase the erosion resistance against overtopping and overflowing. Lime treatment of soils is a technique widely used for soils improvement and stabilization for construction of roads, highways, railways, platforms [1], [2]. If the use of lime for transportation infrastructures is well-known, however the principles of lime treatment for hydraulic earthen structures remains barely applied or even forgotten (European case). This paper describes the SOTREDI project, 'SOil TREatment for DIkes', undertaken by Lhoist Group, a lime producer, since 2005. The aim of the project was to investigate the benefits of lime treatment of soils, to measure and describe the relevant properties of these materials for an application in hydraulic context. Besides the experimental campaign at lab scale, full-scale experimental dikes were also built in order to prove the feasibility of the lime treatment and placement processes, and the performance of this kind of innovative structure.