Blenheim sits on a complex mix of Wairau Plains alluvium. The groundwater table is often shallow -- within 2 meters in many areas near the river. This creates real challenges for standard shallow footings. Liquefaction susceptibility in the sandy silts demands a deep foundation strategy that bypasses the problematic upper strata. Our pile foundation design work focuses on transferring structural loads to the competent gravel layers or Tertiary bedrock below. We do not just apply a generic formula. We interpret site-specific CPT data and SPT blow counts to model lateral capacity and skin friction along the pile shaft. For projects near the Taylor River or in the Springlands area, understanding scour depth becomes critical to the final pile cap elevation and overall foundation robustness.
A pile design is only as reliable as the geotechnical model beneath it. On the Wairau Plains, that model must account for liquefaction and shallow groundwater.
