The 'Green-Ampt' infiltration model computes infiltration rate based on:
Choose the correct answer
Only past rainfall intensity
Saturated hydraulic conductivity, capillary suction at wetting front, and soil moisture deficit — physically based piston model
Only temperature and evapotranspiration
Only daily rainfall totals
Correct Answer
B. Saturated hydraulic conductivity, capillary suction at wetting front, and soil moisture deficit — physically based piston model
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Green-Ampt (1911): physically based model. f = K×(1 + ψΔθ/F) where K = saturated hydraulic conductivity, ψ = wetting front suction head (capillary), Δθ = deficit (n-θi), F = cumulative infiltration. Wetting front assumed to be sharp (piston flow). Compared to Horton (empirical), Green-Ampt is physically based and allows different soil layers. Used in: SWMM, HEC-HMS for urban hydrology.
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