Table 2.

Model performance for each site and parameter across the study period (November 2021 - June 2024). The coefficient of determination (R²), Nash-Sutcliffe efficiency (NSE), percent bias (PBIAS), and root mean squared error (RMSE) values are shown as indicators of model performance. ‘Storm Events’ shows the number of individual storm events that were included in the model dataset at each site, and ‘Storm Sample Composition’ provides the percentage of storm event samples relative to the entire dataset for that parameter.

Site code	Parameter	Storm events	Storm sample composition	R 2	NSE	PBIAS	RMSE
MGT	TN	2	55%	0.74	0.72	−2.7	0.04
	TP	2	55%	0.81	0.79	0.5	0.10
	TSS	1	44%	0.92	0.92	2.0	0.18
PKO-UE	TN	2	62%	0.88	0.83	−7.9	0.09
	TP	2	62%	0.81	0.80	3.5	0.17
	TSS	2	67%	0.95	0.94	1.5	0.14
PKO-UW	TN	2	54%	0.80	0.79	7.5	0.06
	TP	2	54%	0.87	0.85	−5.2	0.11
	TSS	2	58%	0.87	0.85	−1.5	0.17
PKO-D	TN	2	59%	0.86	0.83	3.0	0.04
	TP	2	59%	0.83	0.82	0.2	0.18
	TSS	2	67%	0.98	0.98	−0.1	0.12
PNG-M	TN	3	56%	0.68	0.66	2.1	0.02
	TP	3	60%	0.71	0.71	−0.3	0.06
	TSS	1	44%	0.97	0.94	−3.7	0.10
PNG-TR1	TN	2	56%	0.66	0.65	−1.1	0.03
	TP	2	56%	0.76	0.74	0.8	0.94
	TSS	2	63%	0.87	0.79	1.6	0.10
PNG-TR2	TN2	2	42%	0.55	0.45	2.4	0.06
	TP2	2	42%	0.91	0.82	4.1	0.07
	TSS2	1	45%	0.84	0.84	−6.3	0.15
PUN	TN	2	56%	0.84	0.83	−0.7	0.07
	TP	2	56%	0.71	0.59	−2.0	0.23
	TSS	1	43%	0.95	0.87	−7.8	0.22
WHR-U	TN1	2	46%	0.36	−0.23	−0.7	0.03
	TP1	2	46%	0.01	−0.98	6.7	0.22
	TSS1	2	50%	0.20	0.19	−2.7	0.28
WHR-D	TN3	2	54%	0.79	0.78	−0.9	0.04
	TP	2	54%	0.93	0.90	4.1	0.09
	TSS	2	59%	0.97	0.96	2.7	0.10

¹Model was deemed unacceptable because NSE < 0.5.

²Model was deemed unacceptable based on visual inspection.

³Model was deemed acceptable but is considered to be of lower quality after visual inspection, despite acceptable model performance indicators.