treatment is highly desirous for maintaining the health of the housed poultry the green depicted in fig1 is one that has been constructed in compliance with the specifications of the united states golf association usga the green includes a top layer 11 that supports a grass turf 12 the top layer is about twelve inches deep and contains a mix that is 80 fine sand and 20 organic matter which is typically peat moss immediately below the top layer is an intermediate layer 13 that is about two to four inches deep and contains choker sand finally a lower layer 14 of pea gravel about four inches deep is placed directly below choker sand layer typically buried beneath the subsoil layer of the green is a duct network that is in communication with the pea gravel bed and serves to carry excess water in the subsoil region away from the green the duct network includes one or more main perforated feeder lines 15 that are interconnected to a series of perforated distribution lines 16 16 the lines are arranged in a herringbone pattern that is dispersed beneath the surface of the green the lines have openings that permit excess water in the soil to be collected in the lines the lines are laid in the ground at an angle so that the collected water is gravity fed.