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ARS Home Pacific West Area Riverside, California Agricultural Water Efficiency and Salinity Research Unit Docs Model





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- Hydraulic Functions
- Hydraulic Parameters

ROSETTA Class Average Hydraulic Parametersheadline bar The table below gives class-average values of the seven hydraulic parameters for the twelve USDA textural classes. Effectively, this table represents the first model of the hierarchical sequence. For the qr, q s, a, n and Ks parameters, the values have been generated by computing the average values for each textural class. For Ko and L the values were generated by inserting the class average values of qr, qs, a, n into Model C2 (see Rosetta's help file). This means that Ko and L are based on predicted parameters and may not be very reliable. The values in parentheses give the one standard deviation uncertainties of the class average valuesTextureClass
N
-- qr -- cm3/cm3
-- qs --cm3/cm3
-- log(a) -- log(1/cm)
-- log(n) -- log10
-- Ks -- log(cm/day)
-- Ko -- log(cm/day)
-- L --Clay
84
0.098
(0.107)
0.459
(0.079)
-1.825
(0.68)
0.098
(0.07)
1.169
(0.92)
0.472
(0.26)
-1.561
(1.39)C loam
140
0.079
(0.076)
0.442
(0.079)
-1.801
(0.69)
0.151
(0.12)
0.913
(1.09)
0.699
(0.23)
-0.763
(0.90)Loam
242
0.061
(0.073)
0.399
(0.098)
-1.954
(0.73)
0.168
(0.13)
1.081
(0.92)
0.568
(0.21)
-0.371
(0.84)L Sand
201
0.049
(0.042)
0.390
(0.070)
-1.459
(0.47)
0.242
(0.16)
2.022
(0.64)
1.386
(0.24)
-0.874
(0.59)Sand
308
0.053
(0.029)
0.375
(0.055)
-1.453
(0.25)
0.502
(0.18)
2.808
(0.59)
1.389
(0.24)
-0.930
(0.49)S Clay
11
0.117
(0.114)
0.385
(0.046)
-1.476
(0.57)
0.082
(0.06)
1.055
(0.89)
0.637
(0.34)
-3.665
(1.80)S C L
87
0.063
(0.078)
0.384
(0.061)
-1.676
(0.71)
0.124
(0.12)
1.120
(0.85)
0.841
(0.24)
-1.280
(0.99)S loam
476
0.039
(0.054)
0.387
(0.085)
-1.574
(0.56)
0.161
(0.11)
1.583
(0.66)
1.190
(0.21)
-0.861
(0.73)Silt
6
0.050
(0.041)
0.489
(0.078)
-2.182
(0.30)
0.225
(0.13)
1.641
(0.27)
0.524
(0.32)
0.624
(1.57)Si Clay
28
0.111
(0.119)
0.481
(0.080)
-1.790
(0.64)
0.121
(0.10)
0.983
(0.57)
0.501
(0.27)
-1.287
(1.23)Si C L
172
0.090
(0.082)
0.482
(0.086)
-2.076
(0.59)
0.182
(0.13)
1.046
(0.76)
0.349
(0.26)
-0.156
(1.23)Si Loam
330
0.065
(0.073)
0.439
(0.093)
-2.296
(0.57)
0.221
(0.14)
1.261
(0.74)
0.243
(0.26)
0.365
(1.42)


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