Table 1

Water quality parameters for ponded remnants of Elizabeth Lake, Los Angeles County, California, USA during a protracted drought. Values marked with an asterisk were instrument maxima or would not stabilize and are not included in calculated means for each pond. In particular, dissolved oxygen values marked with an asterisk are errors based on solubility data presented by Carpenter (1966).

Location	Date	Time (24 h)	Temperature (°C)	pH	Conductivity (mS/cm)	Salinity (ppt)	Dissolved oxygen (mg/L)	Turbidity (NTU)	Total dissolved solids (g/L)	Oxidation–reduction potential (ORPmV)
Pond 1	8/28/2014	11:27	24.11	9.13	18.10	10.7	23.14⁎	304.0	11.30	52
	9/16/2014	11:37	26.55	8.66	33.60	21.0	12.03	459.0	20.50	72
	9/17/2014	13:53	28.64	9.09	34.00	21.3	8.50	153.0	20.70	59
	11/24/2014	12:49	10.19	8.4	45.80	28.9	16.44⁎	>1000⁎	27.90	−116
			22.37	8.82	32.88	20.48	10.27	305.33	20.10	16.75
Pond 2	8/25/2014	07:50	16.25	8.73	20.80	12.4	2.94	780.0	12.90	−113
	8/28/2014	11:29	20.94	8.95	21.70	13.0	3.58	573.0	13.40	−19
	9/16/2014	11:40	19.71	8.7	43.50	27.9	1.80	670.0	26.50	−231
	9/17/2014	13:57	25.41	8.91	43.80	28.2	22.75⁎	885.0	26.70	83
	11/24/2014	12:53	14.18	8.36	68.40	45.9	1.25	>1000⁎	41.00	−220
			19.30	8.73	39.64	25.48	2.39	727.00	24.10	−100.00
Pond 3	8/28/2014	11:33	21.39	8.95	18.90	11.2	1.59	257.0	11.70	−144
	9/16/2014	11:45	21.14	9	33.40	20.9	5.74	154.0	20.40	21
	9/17/2014	14:08	23.16	8.95	33.80	21.2	1.27	746.0	20.60	−39
	11/24/2014	13:16	9.80	8.7	53.90	34.6	3.00	>1000⁎	32.30	−3
			18.87	8.90	35.00	21.98	2.90	385.67	21.25	−41.25
Pond 4	8/29/2014	06:57	18.37	9.68	8.82	5.0	2.24	>1000⁎	5.55	−255
	9/17/2014	11:33	19.09	9.69	13.20	7.6	7.45	>1000⁎	8.20	−81
	9/18/2014	06:25	17.95	9.53	11.50	6.6	2.69	>1000⁎	7.12	−304
	11/24/2014	13:37	11.00	9.21	22.90	13.5	23.21⁎	>1000⁎	14.20	59
			16.60	9.53	14.11	8.18	4.13	>1000	8.77	−145.25