When answering this question it is important to separate out the different types of soil stabilisation on the market; soil ‘enhancement’ and lime ‘modification’  are low dose stabilisation processes and rely on having a more permanent surface covering used above them, such as stone chippings or concrete ‘armoured’ layers. Essentially they are providing an improved foundation bearing layer. As with all permanent road construction, drainage of the foundation is important to the longevity of the road, and this is also true of these forms of soil treatemnt to prevenet any softening of the enhanced or modified layers. A RoadCem stabilised soil layer using a higher cement binder content  with the nano-scale benefits produces a stronger, stiffer and more robust stabilised layer.  Whilst it is always good practice to  ensure adequate surface and sub-surface drainage for any temporary or permanent stabilised soil structure it is importnat to note that RoadCem layers are highly impermeable and can tolerate repeated flood events and high ground water – making them ideal for temporary works applications especially in low lying flood plains or over soft soils. Details of how RoadCem has been used  in Mexico with UNESCO can be found here – UNESCO RoadCem Mexico