Soil flows from bottom of spudcan back into the cavity on the exposed top of the spudcan.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards
Soil that flows from beneath the spudcan around the sides and onto the top. NOTE Backflow is part of backfill (3.7).
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards