Hi, I'm just looking the old way (formulas) to design the aggregates grading for a french drain without the geotextiles. I need to manage a seepage in a slope, but the only and unique way is to build the french drain following a secant wall construction method, so the filter fabric cannot be used. The surrounding mass is composed of a mixture of silt and clay in a limestone formation with a lot of small tunnels structure or system due to water piping.
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