Impermeable Floor
Impermeable Floors are a 
Landscaping utility building to separate fluid flows on vertical levels. Introduced in "Update 6 - the Wonders of Water", Impermeable Flooring allows many non-watertight solid buildings to hold water above it, or prevent a body of water from raising above it.
Construction
Impermeable Floors can be placed atop any solid surface, and would be required for 
Platforms, 
Metal Platforms and 
Overhangs to hold or suppress water. As most non-levee buildings do not block water from below, Impermeable Floors would be required to prevent buildings on Platforms and similar supporting buildings from flooding from below.
Unlike 
Contamination Barriers and 
Irrigation Barriers, Impermeable Flooring can be built underneath other buildings, and allow other applicable buildings to be built above it.
While being a thinner floor-based alternative to 
Levees, Impermeable Floor tiles also allow for vertical connections like 
Vertical Power Shafts, 
Power, and File:Solid Tubeway icon.png Solid Tubeways to pass through.
