An Improved Prediction Method of Soil-Water Characteristic Curve by Geometrical Derivation and Empirical Equation

Table 2

The of point , , and of 45 SWCC datasets fitting to Gardner equation, VG equation, and FX equation.

Type	Data resource	Gardner equation					VG equation					FX equation
		Sand	[38]	7.50	4.81	11.69	1.00	1.00	4.70	4.50	4.95	1.34	1.17	5.62	4.86	6.44	1.01	0.94
[38]	1.11		0.80	1.54	1.00	1.00	1.07	0.79	1.50	1.15	1.16	1.13	0.96	1.32	1.30	0.92
[26]	22.14		14.82	33.09	1.00	1.00	23.69	15.96	37.28	0.92	1.15	21.66	15.26	30.50	1.02	0.98
[39]	2.86		1.75	4.68	1.00	1.00	2.86	2.04	5.08	0.93	1.70	2.32	1.68	3.16	1.01	0.95
[40]	23.71		16.67	33.74	1.00	1.00	22.66	16.09	32.42	1.07	1.05	22.26	16.50	29.69	1.01	0.96
[40]	1.71		1.22	2.39	1.00	1.00	1.51	1.10	2.10	1.11	1.05	1.57	1.15	2.09	0.99	0.94
[41]	2.17		1.69	2.78	1.00	1.00	1.91	1.67	2.31	0.98	1.47	1.91	1.68	2.20	1.23	1.15
[42]	0.51		0.02	10.92	1.00	1.00	0.49	0.07	6.82	0.83	1.39	0.08	0.07	0.08	1.04	0.94
[20]	5.88		4.30	8.03	1.00	1.00	4.73	3.74	6.61	1.10	1.42	4.95	4.18	5.77	0.98	0.92
[20]	4.30		1.99	9.28	1.00	1.00	3.95	1.69	8.89	0.52	0.96	3.87	1.93	9.14	0.71	1.23
[43]	2.51		0.75	8.35	1.00	1.00	2.06	0.92	6.26	1.77	1.38	2.18	0.92	4.97	0.98	0.95
[44]	180.15		94.04	345.12	1.00	1.00	104.56	80.12	140.33	0.89	1.11	124.03	103.02	147.96	1.02	0.95
[44]	183.69		98.81	341.48	1.00	1.00	140.36	85.91	234.85	1.11	1.05	144.38	107.77	191.00	1.01	0.96
[45]	2.96		0.82	10.71	1.00	1.00	2.91	1.23	10.96	0.82	1.54	1.68	1.06	3.06	1.29	1.30
[45]	3.64		1.53	8.65	1.00	1.00	3.61	1.88	8.76	0.75	1.36	3.33	2.92	3.80	1.05	0.98
[34]	1769.98		400.89	7814.73	1.00	1.00	1786.54	511.89	6112.25	0.93	0.98	1937.77	419.46	7910.79	0.90	0.92
[34]	1280.15		416.53	3934.36	1.00	1.00	1707.71	606.61	4685.02	0.91	0.98	1204.32	624.03	2315.77	1.01	0.99
[7]	742.25		356.39	1545.85	1.00	1.00	679.01	333.14	1396.41	1.00	1.01	669.57	469.32	1209.23	0.74	1.66
[7]	1993.11		249.91	1.59  10^4	1.00	1.00	2318.54	458.22	1.16  10^4	0.93	0.99	632.86	115.83	2923.60	0.94	0.90
[38]	3927.64		470.87	3.28  10^4	1.00	1.00	4914.27	619.07	3.99  10^4	0.95	1.00	3532.32	500.16	2.55  10^4	1.03	1.01
[38]	6104.89		431.30	8.64  10^4	1.00	1.00	6651.27	482.94	8.31  10^4	0.88	0.96	6488.40	472.30	8.47  10^4	1.31	0.98
[46]	6.08		3.52	10.52	1.00	1.00	6.44	3.64	11.19	0.96	0.97	5.63	4.40	7.16	1.04	0.98
Silt	[47]	514.29	65.78	4020.82	1.00	1.00	101.68	32.10	325.64	1.05	1.01	65.13	29.16	135.12	0.96	0.91
	[47]	877.77	84.28	9141.81	1.00	1.00	93.37	24.84	355.60	1.08	1.01	149.07	26.90	3686.97	1.02	1.87
	[48]	70.11	16.15	304.37	1.00	1.00	65.53	15.57	275.97	1.00	1.00	57.10	13.74	219.80	0.98	0.95
	[44]	513.71	87.46	3017.35	1.00	1.00	549.34	96.48	3123.20	1.00	1.00	501.14	103.32	3107.87	1.13	1.16
	[45]	63.62	21.83	185.38	1.00	1.00	39.56	15.63	101.32	1.07	1.01	47.09	18.84	109.72	0.96	0.92
	[45]	23.36	7.65	71.37	1.00	1.00	27.71	9.01	84.62	0.97	0.99	28.78	27.44	30.67	1.44	1.33
	[49]	21.97	19.55	24.70	1.00	1.00	13.30	12.94	13.76	1.41	1.20	16.82	13.38	20.72	0.98	0.91
	[50]	25.97	8.25	81.73	1.00	1.00	15.83	4.58	55.08	1.09	1.01	17.74	6.02	47.15	0.96	0.90
	[42]	302.63	73.52	1245.69	1.00	1.00	291.44	72.39	1174.08	1.00	1.00	279.61	77.88	911.76	0.95	0.92
	[42]	945.32	73.25	1.22  10^4	1.00	1.00	596.69	65.22	5426.52	0.97	1.00	808.67	370.40	1918.41	1.08	1.11
	[51]	2477.66	270.50	2.27  10^4	1.00	1.00	3137.80	189.46	2.80  10^4	0.79	0.78	2012.34	135.66	2.16  10^4	1.20	0.88
Clay	[7]	2363.75	50.31	1.11  10^5	1.00	1.00	1.61  10^4	943.47	2.69  10^5	0.96	0.99	2385.66	73.03	1.10  10^5	0.78	1.10
	[7]	7430.10	1014.25	5.44  10^4	1.00	1.00	5347.42	765.62	3.75  10^4	1.02	1.00	1.40  10^4	232.70	2.53  10^5	0.67	0.71
	[14]	2961.28	629.33	1.39  10^4	1.00	1.00	2945.55	634.51	13669.10	1.00	1.00	3020.23	662.40	1.15  10^4	0.90	0.88
	[43]	66.27	7.92	554.33	1.00	1.00	91.27	14.69	563.92	0.94	1.00	64.34	6.96	527.20	1.07	0.95
	[44]	256.59	67.82	970.84	1.00	1.00	237.60	64.70	940.80	0.72	1.06	148.00	47.51	908.48	0.87	1.60
	[44]	432.81	67.72	2766.34	1.00	1.00	233.85	25.60	2179.71	1.26	1.01	248.25	223.76	272.49	0.94	0.90
	[52]	11.42	4.74	27.53	1.00	1.00	10.64	4.64	25.77	0.94	1.07	9.26	4.03	19.43	0.94	0.89
	[53]	2916.26	1035.33	8214.35	1.00	1.00	2694.63	967.33	7548.71	0.88	1.01	2651.25	978.06	7808.75	0.75	1.08
	[53]	2569.65	903.52	7308.18	1.00	1.00	2281.71	871.06	7791.75	0.84	1.28	2284.17	865.65	7995.74	0.75	1.29
	[54]	3535.16	513.19	2.44  10^4	1.00	1.00	2560.38	419.47	1.60  10^4	1.03	1.01	1348.69	297.34	4066.30	0.83	0.73
	[54]	8007.59	1254.26	5.11  10^4	1.00	1.00	6715.74	1105.24	4.11  10^4	1.01	1.00	4612.57	733.92	4.04  10^4	1.23	1.18
	[55]	1757.23	304.32	1.01  10^4	1.00	1.00	1877.85	325.12	1.08  10^4	0.98	1.00	1836.05	349.76	1.18  10^4	1.06	1.12