Abstract: An anti-icing spray assembly includes a base housing having a generally open top and a cavity. The base housing is adapted to be mounted in a roadway. A spray housing is removably secured to the base housing with at least a portion of the spray housing being disposed in the cavity of the base housing. The spray housing defines an interior chamber and is watertight so as to substantially prevent water from entering the interior chamber. The spray housing includes at least one spray outlet adapted to spray an anti-icing agent onto the roadway. At least one valve assembly is disposed in the interior chamber of the spray housing. The valve assembly is operably connected to the at least one spray outlet. The valve assembly is moveable between a closed position and an open position, wherein the valve assembly is adapted to permit the flow of the anti-icing agent through the at least one spray outlet and onto the roadway when moved to the open position.

Abstract: A device for use in determining the depth of water accumulating on the surface of a pathway, such as an airport runway or the like. A block of electrically insulative material is embedded in a pathway with the top surface of the block being substantially flush with the pathway surface and exposed to atmospheric precipitation. A sensor comprising first and second capacitors, each of which has first and second coplanar spaced apart electrodes, is positioned within the block with the electrodes of the first capacitor positioned adjacent to and inclined with respect to the top surface of the block and with the electrodes of the second capacitor being positioned a substantially greater distance from the top surface of the block whereby an accumulation of water on the surface of the block affects the dielectric, capacitance and conductance of the first capacitor without substantially affecting the dielectric, capacitance and conductance of the second.