Table 2: Average fitted parameter and AIC values for the soil water retention models across hillslopes.

Hillslope positionAverage parameter values (SE)AICg
  derivationModel c d e f
(cm3/cm3)(MPa)(dimensionless)

Summit0.379
 AbsentCA0.000 (—)−0.0022 (0.0006)3.29 (0.34)−27.6
 MeasuredBC0.065 (—)−0.0042 (0.0006)0.60 (0.05)−28.5
VG50.065 (—)−0.0042 (0.0006)11.14 (0.04)0.054 (0.005)−26.5
VG40.065 (—)−0.0053 (0.0010)1.65 (0.07)−28.1
TA0.065 (—)−0.0115 (0.0035)−11.1
RU0.065 (—)−0.0011 (<.0001)16.66 (5.07)−13.5
 ModifiedBC0.064 (0.011)−0.0042 (0.0008)0.69 (0.16)−30.1
VG50.064 (0.008)−0.0042 (<.0001)11.83 (<.01)0.059 (0.006)−28.1
VG40.066 (0.011)−0.0053 (0.0012)1.79 (0.20)−29.4
TA0.088 (0.005)−0.0055 (0.0007)−24.1
RU0.087 (0.005)−0.0011 (<.0001)5.43 (1.40)−24.5
 EstimatedBC0.051 (0.015)−0.0037 (0.0007)0.51 (0.10)−29.4
VG50.051 (0.011)−0.0037 (<.0001)11.05 (<.01)0.046 (0.004)−27.4
VG40.055 (0.015)−0.0048 (0.0012)1.58 (0.13)−28.5
TA0.106 (0.014)−0.0070 (0.0019)−15.6
RU0.098 (0.015)−0.0011 (<.0001)9.93 (4.11)−16.8
Backslope0.391
 AbsentCA0.000 (—)−0.0023 (0.0004)3.61 (0.23)−32.1
 MeasuredBC0.073 (—)−0.0040 (0.0006)0.54 (0.04)−28.8
VG50.073 (—)−0.0040 (0.0006)21.21 (0.05)0.025 (0.002)−26.8
VG40.073 (—)−0.0053 (0.0009)1.59 (0.06)−29.4
TA0.073 (—)−0.0140 (0.0008)−10.2
RU0.073 (—)−0.0011 (<.0001)20.87 (6.05)−12.8
 ModifiedBC0.061 (0.014)−0.0034 (0.0006)0.51 (0.10)−33.6
VG50.061 (0.010)−0.0034 (<.0001)9.68 (<.01)0.052 (0.005)−31.6
VG40.066 (0.009)−0.0044 (<.0001)1.58 (0.06)−32.9
TA0.102 (0.006)−0.0055 (0.0009)−21.9
RU0.100 (0.007)−0.0011 (<.0001)5.57 (1.94)−22.5
 EstimatedBC0.042 (0.015)−0.0032 (0.0005)0.39 (0.06)−33.3
VG50.042 (0.011)−0.0032 (<.0001)9.38 (<.01)0.042 (0.003)−31.3
VG40.049 (0.011)−0.0042 (<.0001)1.45 (0.03)−32.3
TA0.120 (0.018)−0.0078 (0.0031)−13.6
RU0.108 (0.019)−0.0011 (<.0001)13.00 (5.66)−15.4
Toeslope0.417
 AbsentCA0.000 (—)−0.0014 (0.0003)5.63 (0.30)−34.5
 MeasuredBC0.120 (—)−0.0030 (0.0009)0.41 (0.06)−23.3
VG50.120 (—)−0.0030 (0.0009)19.63 (0.33)0.021 (0.003)−21.3
VG40.120 (—)−0.0039 (0.0013)1.44 (0.07)−24.0
TA0.120 (—)−0.0177 (0.0057)−8.1
RU0.120 (—)−0.0011 (<.0001)29.02 (10.26)−10.5
 ModifiedBC0.000 (—)−0.0014 (0.0003)0.18 (0.01)−32.5
VG50.000 (—)−0.0014 (<.0001)14.34 (0.24)0.012 (<.001)−30.5
VG40.000 (—)−0.0016 (<.0001)1.18 (<.01)−32.8
TA0.149 (0.005)−0.0039 (0.0008)−23.4
RU0.149 (0.005)−0.0011 (<.0001)2.35 (1.23)−23.4
 EstimatedBC0.000 (—)−0.0014 (0.0003)0.18 (0.01)−32.5
VG50.000 (—)−0.0014 (<.0001)14.45 (1.64)0.012 (0.001)−30.5
VG40.000 (—)−0.0016 (<.0001)1.18 (<.01)−32.8
TA0.182 (0.020)−0.0065 (0.0019)−11.3
RU0.162 (0.028)−0.0011 (<.0001)15.39 (10.95)−12.4

a is measured saturation water content.
b is residual water content.
c is the air entry matric suction ( , and of the CA, BC, and RU models, resp.).
d is the capillary pressure at the inflection point on the water retention curve ( , , and   of the VG5, VG4, and TA models, resp.).
e is a dimensionless parameter ( , and of the CA, BC, VG5, VG4, and RU models, resp.).
f is a dimensionless parameter ( of the VG5 model).
gA lower value of Akaike Information Criterion (AIC) indicates a better model fit.