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- HEINEN, M.; RAATS, P. A. C.
- Soil science 1990 v.150 no.1 pp. 401-412
- mathematical models; equipment; unsaturated flow; soil water movement
- ... This article evaluates two approximate analytical models, viz, model-Philip and model-Guelph, that describe the steady outflow from a constant-head-well permeameter into an unsaturated soil. The two models recognize the existence of a saturated zone around the borehole and consider the combined influence of the saturated-unsaturated soil on the steady outflow from the well. The two models yield an ...