Such disasters can be just the beginning. The threat of fire is a great concern during a flood, whether it was the result of natural forces or was caused by an explosion. Flood waters often carry debris that can ram into and rupture flammable liquid tanks or piping. These liquids, generally lighter than water, can float into other areas where they might come into contact with an ignition source. In addition, debris can break sprinkler piping, disabling the fire protection system's effectiveness.
Floods often affect the operation of fire pumps, as well.
They can be flooded or the pump houses might be carried away entirely. Another flooding outcome that usually isn't anticipated is danger to below-floor storage tanks. Flood waters can hydrostatically lift such tanks if they are not full or if their contents are lighter than water, damaging both the tank and the building floor above it. This usually results in the contamination or loss of tank contents. If the contents are flammable, their release will dramatically increase the risk of fire.