Philips Equation. Recall Richard’s Equation Assume K and D are functions of q , not z Solution Two terms represent effects of Suction head Gravity head S – Sorptivity Function of soil suction potential Found from experiment. Infiltration into a horizontal soil column.
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Θ = Θo for x = 0, t > 0
Θ = Θn for t = 0, x > 0
q = soil water flux = evaporation rate