1. Soil Physics with HYDRUS: Chapter 3 Equations, Tables, and Figures

2. 3.1 – 3.5

3. 3.6 – 3.9

4. 3.10 – 3.13

5. 3.14 – 3.17

6. 3.18 – 3.20

7. 3.21 – 3.25

8. 3.26 – 3.30

9. 3.31 – 3.34

10. 3.35 – 3.39

11. 3.40

12. TABLE 3.1 Brooks and Corey (1964) soil hydraulic parameters (K s, θ r, θ s, h a, and λ) for 11 textural classes (Rawls et al., 1982). Macroscopic capillary length (λ c ) calculated using Equation 3.21 and Equation 3.25. Textural classKsKs θrθr θsθs haha λλcλc (cm d -1 ) (cm 3 cm -3 ) (cm)(-)(cm) Sand504.00.0200.417-7.260.5929.88 Loamy sand146.60.0350.401-8.690.47412.28 loam62.160.0410.412-14.70.32222.18 Loam31.680.0270.434-11.10.22017.79 Silt loam16.320.0150.486-20.70.21133.38 Sandy clay loam10.320.0680.330-28.10.25044.16 Clay loam5.520.0750.390-25.90.19442.27 Silty clay loam3.600.0400.432-32.60.15155.03 clay2.880.1090.321-29.20.16848.61 Silty clay2.160.0560.423-34.20.12758.96 Clay1.440.0900.385-37.30.13164.07

13. TABLE 3.2 Soil properties (texture, sand, silt, clay, structure, and K s ) for the Cecil loamy sand (plot 4 from Bruce et al., 1983). HorizonTextureClaySiltSandStructureKsKs %%cm h -1 ApLoamy sand71578Weak, medium granular19.19 BAClay loam372043Weak, medium, subangular blocky 7.69 Bt1Clay502030Strong, medium, subangular blocky 10.73 Bt2Clay412534Strong, medium, subangular blocky 0.206 BCClay loam362737Weak, medium, subangular blocky 0.035 CSandy clay loam 24 52Massive0.467

14. TABLE 3.3 Soil texture/structure categories for estimation of macroscopic capillary length (λ c ), adapted from Elrick and Reynolds (1992). Soil texture/structure categoryλcλc (cm) Coarse and gravelly sands; may also include some highly structured soils with large cracks and/or macropores 2.8 Most structured soils from clays through loams; also includes unstructured medium and fine sands 8.3 Soils which are both fine textured (clayey) and unstructured25 Compacted, structureless, clayey materials such as landfill caps and liners, lacustrine or marine sediments, etc 100

15. TABLE 3.4 Dimensionless coefficients for the polynomial (Equation 3.35) describing the geometric factor G, valid for H/r < 10 (Bosch and West, 1998) Soil texture/structureA1A1 A2A2 A3A3 A4A4 Sand0.0790.516-0.0480.002 Structured loams and clays0.0830.514-0.0530.002 Unstructured clays0.0940.489-0.0530.002

19. Figure 3.4 Saturated hydraulic conductivity as a function of clay fraction for 324 soils from the UNSODA database (Nemes et al., 2001).