We intend to drive the push-in VW tips directly into soft marine muds prior to placing fill. These piezometers are required to function fully over the six year project life. Is there serious potential for filter clogging and loss of performance in such an environment? Would a sand filter zone provide only minor additional protection?
Answer: If the soil is saturated and the piezometer is saturated, there should be no problem with clogging because there is no place for the mud to go. Clogging over time implies some kind of flow, but water does not actually flow through the filter. The piezometer measures static hydraulic pressure.