Timber cribwork for a water-retaining bastion
A lattice of beams and driven stakes forming a bastia to support and hold back water
A dense lattice of crossed beams and driven stakes is drawn in perspective, studded with short cylindrical piles or posts along its top and its courses. The note names it a bastia — a bastion or fieldwork — that serves as a sostentaculo d'acqua, a structure to support or hold back water. The construction reads as a timber crib or coffer for hydraulic works.
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A bastion to hold back water
The note labels the drawn structure a bastia, or support for water — a barrier or crib meant to sustain and contain a body of water. It frames the timber lattice as a piece of hydraulic engineering rather than mere carpentry.
Lattice of beams and stakes
The body of the sheet is filled by a crib of crossed timbers laid in courses, with short vertical piles set at the intersections. The interlocking beams and driven stakes are the constructional means by which the water-retaining bastion would be built.