On a site with nobody there at night, the passive barrier suits vehicle gates because it rises on the floodwater alone. On an existing slab it can be surface-mounted with a ramp each side, which avoids cutting a recess.
Where the site already has power and a control room, an automatic barrier gives remote control over lowering and reset. Aluminium sets suit doors that staff can close ahead of a Flood Watch.
For a quote, send gate and door widths, photos, the flood depth to hold back, and the heaviest vehicle that crosses each opening.