LAUSR

We present a method to create a horizontal resistance layer at desired depth below soil surface to decrease seepage over a relatively large area. The layer is produced in a continuous process by means of numerous temporary screens of wells. Between each pair of screens groundwater flow is forced in horizontal direction. In the center of such flow, along virtual parallel flow lines, a chemical, viscous and dense fluid is injected that produces a clogging substance within several hours. The impact of density is overcome by the forced flow between screens. The impact of viscosity on the flow distribution is handled by adaptation of the fluxes and heads at the filters in the screens. The resulting procedure includes multistep injection and is supported by model simulations. Though a small-scale proof of concept has been successful, the composition of the optimal chemical mixture needs further research.