the arrangement of connected lengths of fire hose and accessories on the ground, beginning at the first pumping unit and ending at the point of water delivery —note a simple (single) hose lay has no laterals; a progressive hose lay has one or more double shutoff (gated) Y-shaped connectors (wyes) inserted in the main line, permitting lateral lines to be run to the fire edge, thus providing continuous application of water during extension of the layThis definition last updated 10/28/2008