Abstract

A sprinkler system weighing, when automatically drained, under 20 pounds per 1000 foot of tubing plus sprinkler heads and, that can be rapidly rolled up by a tractor carrying a reel, is made of two concentric polyester plastic tubes both 2 inches in diameter with 0.001 inch thick walls. The two concentric tubes are sealed together at the top and 0.04 inch diameter holes are spaced at 6 foot intervals along the top seal so that water flowing through the inner tube can spray out. The outer tube is aluminized to protect the polyester against the sun and a black stripe is painted along the top of the outer tube so that photoelectric cells can make the spray holes along the black line be unrolled on top when the irrigation tubing is put in place. When it is desired to move the irrigation tubing, the water is shut off and air is forced between the inner and outer tubes. This about completely forces the water out of the inner tube making an extremely light load to roll up and carry. The above sprinkler system is very advantageous in irrigating land like that between Columbus, Ohio and Omaha, Nebraska where pressures above 15 pounds per square inch gage are rarely necessary.