Patent ID: 7040839

Claim:
A system to provide subsurface irrigation for growing crops, plants, trees, and landscaping, comprising; a header adapted to receive and contain water under pressure; a plurality of supply ports from said header; a tube having a first length with an inlet end connected to a respective one of said supply ports and an outlet end spaced from said inlet end, a second length with an inlet end and a second end, the second end of the second length being closed during irrigation operation, and opened during a flushing operation, a tubular bight joining the outlet end of the first length to the inlet end of the second length, each length having along its linear extent a plurality of emitters to pass fluid from inside the tube to the outside of the tube; said first and second lengths being substantially linearly aligned with and joined over at least a portion of their linear extent, substantially to maintain said linear alignment, said emitters being so disposed and arranged that the distance between emitters on one length and nearby emitters on the other length are known, and a cavitating mixer injector injecting gas into said water upstream from said tubes whereby to provide said gas in the form of micro-bubbles in the water supplied to the tube.