Techniques and Methods 6-A19
U.S. GEOLOGICAL SURVEY
Techniques and Methods 6-A19
Figure 4. Comparison of results from the kinematic-wave approximation used to simulate unsaturated flow (UZF1) with a two-dimensional finite-difference solution of Richards’ equation (VS2DT; Healy, 1990) assuming evapotranspiration demand rates of: (A) 5 × 10-8 meter per second, (B) 5 × 10-7 meter per second, and (C) 1 × 10-6 meter per second.