Section 02.03.03.695 - AUTOMATIC LOW PRESSURE DRAIN01.Criteria. An automatic low pressure drain will meet the following criteria: (3-15-22)a. Is installed upstream of the irrigation line check valve at the lowest point of the horizontal water supply pipeline; (3-15-22)b. Does not extend into the horizontal pipe beyond the inside surface of the bottom of the pipe; (3-15-22)c. Is at least three-fourths (¾) inch in diameter with a closing pressure of not less than five (5) psi; (3-15-22)d. If the drain is within twenty (20) feet of the water source, contains a corrosion resistant tube, pipe, hose, or similar conduit one-half (1/2) inch in diameter to discharge a solution at least twenty (20) feet down slope from the irrigation water source and away from any other water sources; and (3-15-22)e. Does not have any valves located on the outlet side of the drain tube. (3-15-22)Idaho Admin. Code r. 02.03.03.695