Enter site geometry, hydraulics, and a geotechnical profile. The solver enumerates every structurally valid abutment/bridge configuration for the site and reports them sorted by cost.
Borehole log, top to bottom. Each row's elevation is the top of that layer — e.g. to log rock encountered at elevation 85 m, add a row with soil type "rock" and top elevation 85. A layer extends down to the next row's top elevation (or, for the last row, indefinitely). The top row always starts at the approach elevation, since that's where the ground surface meets the abutment. Top elevations must strictly decrease down the table, and the deepest row must be at or below the river bed / obstacle elevation.