Skip to content

ptfkit.gunarathna2019

ptfkit.gunarathna2019

Point water-retention regressions for tropical Sri Lankan soils.

Reference

Gunarathna, M. H. J. P., Sakai, K., Nakandakari, T., Momii, K., Kumari, M. K. N., & Amarasekara, M. G. T. S. (2019). Pedotransfer functions to estimate hydraulic properties of tropical Sri Lankan soils. Soil & Tillage Research, 190, 109-119. https://doi.org/10.1016/j.still.2019.02.009 DOI: 10.1016/j.still.2019.02.009

Territory

Tropical Sri Lanka.

Dataset

323 soil horizons retained after removing samples with missing water-content data from the SRI-CANSOL survey of 110 profiles. The survey covers almost all soil series and land uses except the northern part of Sri Lanka. Models were evaluated using tenfold cross-validation.

FUNCTION DESCRIPTION
calc_ptf_gunarathna2019_vwc10_set1

Estimate volumetric water content at -10 kPa using Set 1.

calc_ptf_gunarathna2019_vwc10_set2

Estimate volumetric water content at -10 kPa using Set 2.

calc_ptf_gunarathna2019_vwc10_set3

Estimate volumetric water content at -10 kPa using Set 3.

calc_ptf_gunarathna2019_vwc10_set4

Estimate volumetric water content at -10 kPa using Set 4.

calc_ptf_gunarathna2019_vwc1500_set1

Estimate volumetric water content at -1500 kPa using Set 1.

calc_ptf_gunarathna2019_vwc1500_set3

Estimate volumetric water content at -1500 kPa using Set 3.

calc_ptf_gunarathna2019_vwc1500_set4

Estimate volumetric water content at -1500 kPa using Set 4.

calc_ptf_gunarathna2019_vwc33_set1

Estimate volumetric water content at -33 kPa using Set 1.

calc_ptf_gunarathna2019_vwc33_set2

Estimate volumetric water content at -33 kPa using Set 2.

calc_ptf_gunarathna2019_vwc33_set3

Estimate volumetric water content at -33 kPa using Set 3.

calc_ptf_gunarathna2019_vwc33_set4

Estimate volumetric water content at -33 kPa using Set 4.

calc_ptf_gunarathna2019_vwc10_set1

calc_ptf_gunarathna2019_vwc10_set1(*, sand: float) -> floating
calc_ptf_gunarathna2019_vwc10_set1(*, sand: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -10 kPa using Set 1.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_10

Volumetric water content at -10 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -10 kPa. Equation evidence: Table 3, VWC10, Set 1. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds. Section 3.1 reports slight overprediction above 64% sand at this pressure.

Source code in ptfkit/gunarathna2019.py
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
def calc_ptf_gunarathna2019_vwc10_set1(
    *,
    sand: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -10 kPa using Set 1.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_10: Volumetric water content at -10 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -10 kPa.
        Equation evidence: Table 3, VWC10, Set 1.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.
        Section 3.1 reports slight overprediction above 64% sand at this pressure.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc10_set1,
        sand,
        out=out,
    )

calc_ptf_gunarathna2019_vwc10_set2

calc_ptf_gunarathna2019_vwc10_set2(*, sand: float, silt: float) -> floating
calc_ptf_gunarathna2019_vwc10_set2(*, sand: ArrayLike, silt: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -10 kPa using Set 2.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_10

Volumetric water content at -10 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -10 kPa. Equation evidence: Table 3, VWC10, Set 2. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
def calc_ptf_gunarathna2019_vwc10_set2(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -10 kPa using Set 2.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_10: Volumetric water content at -10 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -10 kPa.
        Equation evidence: Table 3, VWC10, Set 2.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc10_set2,
        sand,
        silt,
        out=out,
    )

calc_ptf_gunarathna2019_vwc10_set3

calc_ptf_gunarathna2019_vwc10_set3(*, sand: float, silt: float, bulk_density: float) -> floating
calc_ptf_gunarathna2019_vwc10_set3(*, sand: ArrayLike, silt: ArrayLike, bulk_density: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -10 kPa using Set 3.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

bulk_density

Bulk density measured using undisturbed cores. (g/cm3)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_10

Volumetric water content at -10 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -10 kPa. Equation evidence: Table 3, VWC10, Set 3. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
def calc_ptf_gunarathna2019_vwc10_set3(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    bulk_density: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -10 kPa using Set 3.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        bulk_density: Bulk density measured using undisturbed cores. (g/cm3)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_10: Volumetric water content at -10 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -10 kPa.
        Equation evidence: Table 3, VWC10, Set 3.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc10_set3,
        sand,
        silt,
        bulk_density,
        out=out,
    )

calc_ptf_gunarathna2019_vwc10_set4

calc_ptf_gunarathna2019_vwc10_set4(*, sand: float, silt: float, organic_carbon: float) -> floating
calc_ptf_gunarathna2019_vwc10_set4(*, sand: ArrayLike, silt: ArrayLike, organic_carbon: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -10 kPa using Set 4.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

organic_carbon

Organic carbon percentage measured by the Walkley-Black method. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_10

Volumetric water content at -10 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -10 kPa. Equation evidence: Table 3, VWC10, Set 4. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
def calc_ptf_gunarathna2019_vwc10_set4(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    organic_carbon: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -10 kPa using Set 4.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        organic_carbon: Organic carbon percentage measured by the Walkley-Black method. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_10: Volumetric water content at -10 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -10 kPa.
        Equation evidence: Table 3, VWC10, Set 4.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc10_set4,
        sand,
        silt,
        organic_carbon,
        out=out,
    )

calc_ptf_gunarathna2019_vwc1500_set1

calc_ptf_gunarathna2019_vwc1500_set1(*, sand: float) -> floating
calc_ptf_gunarathna2019_vwc1500_set1(*, sand: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -1500 kPa using Set 1.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_1500

Volumetric water content at -1500 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -1500 kPa. Equation evidence: Table 3, VWC1500, Set 1. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds. Section 3.1 reports slight overprediction above 66% sand at this pressure.

Source code in ptfkit/gunarathna2019.py
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
def calc_ptf_gunarathna2019_vwc1500_set1(
    *,
    sand: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -1500 kPa using Set 1.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_1500: Volumetric water content at -1500 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -1500 kPa.
        Equation evidence: Table 3, VWC1500, Set 1.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.
        Section 3.1 reports slight overprediction above 66% sand at this pressure.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc1500_set1,
        sand,
        out=out,
    )

calc_ptf_gunarathna2019_vwc1500_set3

calc_ptf_gunarathna2019_vwc1500_set3(*, sand: float, bulk_density: float) -> floating
calc_ptf_gunarathna2019_vwc1500_set3(*, sand: ArrayLike, bulk_density: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -1500 kPa using Set 3.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

bulk_density

Bulk density measured using undisturbed cores. (g/cm3)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_1500

Volumetric water content at -1500 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -1500 kPa. Equation evidence: Table 3, VWC1500, Set 3. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
def calc_ptf_gunarathna2019_vwc1500_set3(
    *,
    sand: float | ArrayLike,
    bulk_density: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -1500 kPa using Set 3.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        bulk_density: Bulk density measured using undisturbed cores. (g/cm3)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_1500: Volumetric water content at -1500 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -1500 kPa.
        Equation evidence: Table 3, VWC1500, Set 3.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc1500_set3,
        sand,
        bulk_density,
        out=out,
    )

calc_ptf_gunarathna2019_vwc1500_set4

calc_ptf_gunarathna2019_vwc1500_set4(*, sand: float, organic_carbon: float) -> floating
calc_ptf_gunarathna2019_vwc1500_set4(*, sand: ArrayLike, organic_carbon: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -1500 kPa using Set 4.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

organic_carbon

Organic carbon percentage measured by the Walkley-Black method. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_1500

Volumetric water content at -1500 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -1500 kPa. Equation evidence: Table 3, VWC1500, Set 4. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
def calc_ptf_gunarathna2019_vwc1500_set4(
    *,
    sand: float | ArrayLike,
    organic_carbon: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -1500 kPa using Set 4.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        organic_carbon: Organic carbon percentage measured by the Walkley-Black method. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_1500: Volumetric water content at -1500 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -1500 kPa.
        Equation evidence: Table 3, VWC1500, Set 4.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc1500_set4,
        sand,
        organic_carbon,
        out=out,
    )

calc_ptf_gunarathna2019_vwc33_set1

calc_ptf_gunarathna2019_vwc33_set1(*, sand: float) -> floating
calc_ptf_gunarathna2019_vwc33_set1(*, sand: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -33 kPa using Set 1.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_33

Volumetric water content at -33 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -33 kPa. Equation evidence: Table 3, VWC33, Set 1. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds. Section 3.1 reports slight overprediction above 66% sand at this pressure.

Source code in ptfkit/gunarathna2019.py
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
def calc_ptf_gunarathna2019_vwc33_set1(
    *,
    sand: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -33 kPa using Set 1.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_33: Volumetric water content at -33 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -33 kPa.
        Equation evidence: Table 3, VWC33, Set 1.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.
        Section 3.1 reports slight overprediction above 66% sand at this pressure.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc33_set1,
        sand,
        out=out,
    )

calc_ptf_gunarathna2019_vwc33_set2

calc_ptf_gunarathna2019_vwc33_set2(*, sand: float, silt: float) -> floating
calc_ptf_gunarathna2019_vwc33_set2(*, sand: ArrayLike, silt: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -33 kPa using Set 2.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_33

Volumetric water content at -33 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -33 kPa. Equation evidence: Table 3, VWC33, Set 2. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
def calc_ptf_gunarathna2019_vwc33_set2(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -33 kPa using Set 2.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_33: Volumetric water content at -33 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -33 kPa.
        Equation evidence: Table 3, VWC33, Set 2.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc33_set2,
        sand,
        silt,
        out=out,
    )

calc_ptf_gunarathna2019_vwc33_set3

calc_ptf_gunarathna2019_vwc33_set3(*, sand: float, silt: float, bulk_density: float) -> floating
calc_ptf_gunarathna2019_vwc33_set3(*, sand: ArrayLike, silt: ArrayLike, bulk_density: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -33 kPa using Set 3.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

bulk_density

Bulk density measured using undisturbed cores. (g/cm3)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_33

Volumetric water content at -33 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -33 kPa. Equation evidence: Table 3, VWC33, Set 3. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
def calc_ptf_gunarathna2019_vwc33_set3(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    bulk_density: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -33 kPa using Set 3.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        bulk_density: Bulk density measured using undisturbed cores. (g/cm3)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_33: Volumetric water content at -33 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -33 kPa.
        Equation evidence: Table 3, VWC33, Set 3.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc33_set3,
        sand,
        silt,
        bulk_density,
        out=out,
    )

calc_ptf_gunarathna2019_vwc33_set4

calc_ptf_gunarathna2019_vwc33_set4(*, sand: float, silt: float, organic_carbon: float) -> floating
calc_ptf_gunarathna2019_vwc33_set4(*, sand: ArrayLike, silt: ArrayLike, organic_carbon: ArrayLike, out: NDArray[floating] | None = None) -> NDArray[floating]

Estimate volumetric water content at -33 kPa using Set 4.

PARAMETER DESCRIPTION
sand

Sand percentage measured by sieve analysis. (%)

TYPE: float | ArrayLike

silt

Silt percentage measured by the pipette method. (%)

TYPE: float | ArrayLike

organic_carbon

Organic carbon percentage measured by the Walkley-Black method. (%)

TYPE: float | ArrayLike

out

Optional output arrays for in-place calculation.

TYPE: NDArray[floating] | None DEFAULT: None

RETURNS DESCRIPTION
theta_33

Volumetric water content at -33 kPa matric potential. (mm/mm)

TYPE: floating | NDArray[floating]

Notes

Prediction target: Volumetric water content at -33 kPa. Equation evidence: Table 3, VWC33, Set 4. Input ranges describe the study observations, not enforced validity limits.

Warning

Predictions are empirical and are not clipped to physical bounds.

Source code in ptfkit/gunarathna2019.py
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
def calc_ptf_gunarathna2019_vwc33_set4(
    *,
    sand: float | ArrayLike,
    silt: float | ArrayLike,
    organic_carbon: float | ArrayLike,
    out: NDArray[floating] | None = None,
) -> floating | NDArray[floating]:
    """Estimate volumetric water content at -33 kPa using Set 4.

    Arguments:
        sand: Sand percentage measured by sieve analysis. (%)
        silt: Silt percentage measured by the pipette method. (%)
        organic_carbon: Organic carbon percentage measured by the Walkley-Black method. (%)
        out: Optional output arrays for in-place calculation.

    Returns:
        theta_33: Volumetric water content at -33 kPa matric potential. (mm/mm)

    Notes:
        Prediction target: Volumetric water content at -33 kPa.
        Equation evidence: Table 3, VWC33, Set 4.
        Input ranges describe the study observations, not enforced validity limits.

    Warning:
        Predictions are empirical and are not clipped to physical bounds.

    """
    return _call(
        _calc_ptf_gunarathna2019_vwc33_set4,
        sand,
        silt,
        organic_carbon,
        out=out,
    )