Table 5.

Best-fit function and concavity of best-fit decline curves caused by low, constant proportional pressure (P1), under different scenarios of time-series quality degradation

		Best-fit function (out of 1000 simulations)			Concavity (out of 1000 simulations)
Degradation type	Specific degradation	Linear (%)	Quadratic (%)	Exponential (%)	Concave (%)	Convex (%)
Years either side of pressure	25 (None)	6.9	42.8	50.3	88.2	11.8
Years either side of pressure	20	6.6	37.4	56	89.7	10.3
Years either side of pressure	15	5.6	35.9	58.5	89.4	10.6
Years either side of pressure	10	8.8	23.3	67.9	90.8	9.2
Years either side of pressure	5	0.1	43	56.9	100	0
Years after pressure	20	7.4	38	54.6	88.2	11.8
Years after pressure	15	4.4	36.7	58.9	87.4	12.6
Years after pressure	10	8.9	28.4	62.7	87.6	12.4
Years after pressure	5	5.5	39.1	55.4	83.8	16.2
Years before pressure	20	9.9	38.4	51.7	90.5	9.5
Years before pressure	15	4.6	42	53.4	90.7	9.3
Years before pressure	10	5.8	38.6	55.6	93.3	6.7
Years before pressure	5	6.8	36.4	56.8	97.9	2.1
Years before pressure	2	18.8	68.9	9.6	59.5	40.5
Years between monitoring	1	6.2	39.2	54.6	88.8	11.2
Years between monitoring	2	7.8	43.4	48.8	88.7	11.3
Years between monitoring	3	9.5	43	47.5	88.3	11.7
Years between monitoring	5	21.3	44	34.7	67.6	32.4
Years between monitoring	8	21.5	61.9	16.6	50.2	49.8
Magnitude of observation error	1	15.8	51.5	32.3	78.7	21.3
Magnitude of observation error	1.5	12.5	62.5	24.4	78.3	21.7
Magnitude of observation error	2	10.8	65.4	21.9	76.7	23.3
Magnitude of observation error	2.5	12.8	72	13.3	70.8	29.2