This is solely educational with real data and I am hoping not for a "ask a geotech" answer please! There is a dike that is surrounded by pounds. On this dike is a pump station which must be built. The water level is located 16' below existing grade. The soils report only bored to a total depth of 31.5' and all the material is silty sand. In the report it does not include the depth of what is to be thought as an impermeable layer. In order to build the pump station we have to excavate below the water table therefore the need of dewatering wells. Thus my conclusion is gravity flow with partial penetration right? I have read many sources and they all say equations and flow nets are not good for partial pen. and gravity flow. So my question is how do I solve this issue? If I don't know where the impermeable layer is I can't even draw a flownet and all the equations depends on total height from impermeable layer to the phreatic surface. I am working out of the the foundations engineering book G.A. Leonards (1962). There is a rough drawing of the location as well.
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