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Peak crop ET = 0

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Peak crop ET = 0.28 in/day.  Leaching Requirement (LR) = 0.04.  Pre-infiltration loss = 7%.  With good management, AE = 83%.  Rainfall is zero.  What drain spacing is required if we are to maintain a 5 foot root zone above the water table?  Drains will be 8 feet deep.  The impermeable barrier is 19 feet below the surface.  The saturated hydraulic conductivity of a Clay Loam soil is 3.46 in/day.