Melbourne's variable geology, from clay-rich basalts in the west to sandy sediments in the southeast, means groundwater behaviour differs block by block. A poorly designed drainage system can turn a stable foundation into a long-term liability. That is why geotechnical drainage design must start with on-site data, not assumptions. We measure in-situ permeability using permeability field testing to get real flow rates, and we verify soil stratification with exploratory test pits to locate perched water tables. These field results feed directly into the drainage layout, ensuring pipes, blankets, and sumps match the actual ground conditions rather than a textbook estimate.
Drainage design in Melbourne's clays must account for seasonal shrinkage and swelling that alter permeability by orders of magnitude.