Point and Line Infiltration—Calculation of the Wetted Soil Surface1
- A. W. Warrick2
For water introduced at a point on the soil surface a finite-sized area becomes wetted which is not exceeded for large times. Similarly, a wetted strip develops parallel to a surface line source. In this paper, relationships are derived to provide the limiting (steady-state) extent of these wetted areas. The quasi-linear assumption necessary for solution is that the unsaturated conductivity K is Ko exp(αh) with h the pressure head (matric potential as a length) and Ko and α constants. Results for the area around a point is in near agreement with Wooding's (1968) approximation Ko/α2q = (πα2ro2 + 4αro)−1 for a slightly different surface boundary condition (ro is the wetted radius and q is the volume of discharge per unit time). For the strip the dimensionless quantity Ko/αq
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