The irrigation distribution system mechanical devices shall consist of an irrigation pipeline check valve, vacuum relief valve, inspection port and low pressure drain.
004.01 The irrigation pipeline check valve shall be located in the pipeline between the irrigation pump and the point of livestock waste injection into the irrigation pipeline and provide a watertight seal. An irrigation distribution system not equipped with a check valve or with a check valve that provides a watertight seal against reverse flow shall be equipped with a check valve model certified to the Director as meeting the leakage test requirements in Appendix I of Title 195 (Nebraska Administrative Code) - Rules and Regulations Pertaining to Chemigation.004.02 The vacuum relief valve shall be located on the pipeline between the irrigation pump and the irrigation pipeline check valve. Its purpose is to prevent creation of a vacuum when the water flow stops.004.03 The inspection port or other viewing device shall be located on the pipeline between the irrigation pump and the irrigation pipeline check valve. In many cases the vacuum relief valve connection can serve as the inspection port. 004.03A The inspection port or viewing device shall be situated in such a manner that the inlet to the low pressure drain can be observed.004.03B A minimum four-inch diameter orifice or viewing area is required.004.04 The low-pressure drain shall be located on the bottom of the horizontal pipe between the irrigation pump and the irrigation pipeline check valve. Its purpose is to drain any mixture of water and livestock waste away from the irrigation water source. 004.04A The drain shall be constructed of corrosion resistant material or otherwise coated or protected to prevent corrosion.004.04B The drain shall have an orifice of at least three-quarter inch diameter and shall not extend into the horizontal pipe beyond the inside surface of the bottom of the pipe; and004.04C When the pipeline water flow stops, the drain shall automatically open. A tube, pipe or similar conduit shall be used to discharge the solution at least 20 feet from the irrigation water source.130 Neb. Admin. Code, ch. 10, § 004