Erratum

Figures & data

Table 3: List of dams used to analyse trophic state based on median in-lake total phosphorus.

																		OECD Trophic State
				Capacity	Median TP	75%ileTP	90%ileTP	95%ileTP	Max TP		Median Chla	75%ile Chla	90%ile Chla	95%ile Chla	Max Chla	Chla n	Sample depth	Median	Median	Max
#	Name	Register #	WMS #	MCM	mg per liter					TP n	micrograms per liter							TP	Chla	Chla
1	Albasini*	A900/03	A9R001	28.25	0.026	0.043	0.226	0.305	0.305	19	1.3	3.83	6.92	7.7	12.7	53	0-5	M	O	M
2	Albert Falls*	U200/01	U2R003	289.12	0.023	0.036	0.044	0.051	0.051	27	1.3	1.25	1.25	3.23	3.3	32	0	M	O	O
3	Allemanskraal*	C400/02	C4R001	179.3	0.216	0.319	0.414	0.415	0.426	20	5.2	48.2	67.3	67.3	67.3	9	0-5	H	M	E
4	Bloemhof*	C900/07	C9R002	1240	0.079	0.109	0.155	0.177	0.489	60	9.6	23.4	56.5	75.6	110.0	54	0-5	E	E	H
5	Blyde River*	B600/02	B6R003	55.09	0.014	0.018	0.026	0.035	0.035	13	1.3	1.25	1.25	2.56	2.8	26	0-5	M	O	O
6	Boegoeberg	D720/01	D7R001	19.9	0.046	0.067	0.092	0.109	3.34	67	3.8	6.32	12.8	17.7	111.0	44	0	E	M	H
7	Bon Accord	A230/08	A2R002	4.38	0.138	0.252	0.409	0.606	1.33	192	70.8	224	502	651	1790.0	218	0	H	H	H
8	Boskop*	C230/04	C2R001	21.03	0.027	0.042	0.058	0.087	0.775	62	1.1	1.25	5.03	7.39	8.2	23	0	M	O	M
9	Bridle Drift	R200/05	R2R003	101.06	0.188	nd			1.06	10	7.3				19.2	4	0	H	M	M
10	Bronkhorstspruit*	B200/01	B2R001	59.73	0.101	0.129	0.16	0.2	1.93	179	42.4	67.2	95.1	115	302.0	215	0-5	H	H	H
11	Buffelskloof*	B400/01	B4R004	5.33	0.026	0.04	0.046	0.052	0.056	53	1.3	1.25	1.56	4.82	13.3	48	0-5	M	O	M
12	Buffelspoort*	A210/03	A2R005	10.25	0.028	0.036	0.093	0.173	0.173	67	7.9	12.6	23.2	24.7	117.0	79	0-5	M	M	H
13	Clanwilliam	E100/02	E1R002	123.58	0.038	0.051	0.073	0.082	0.2	59	1.3	2.44	4.84	10.4	24.2	66	0	E	O	M
14	Disaneng	D410/02	D4R003	14.82	0.044	0.065	0.088	0.152	1.43	186	1.3	4.36	10	18.8	38.1	57	0	E	O	E
15	Douglas Barrage	C900/05	C9R003	16.24	0.041	0.058	0.093	0.171	0.583	310	4.3	13	23	27	43.0	29	0-5	E	M	E
16	Driekoppies*	X100/22	X1R004	250.92	0.019	0.028	0.04	0.057	0.157	38	1.3	1.25	3.08	5.32	9.4	34	0	M	O	M
17	Flag Boshielo*	B501/11	B5R002	185	0.035	0.048	0.067	0.084	2.12	99	9.0	14.6	21.8	26.2	37.0	111	0-5	E	E	E
18	Gariep*	D350/02	D3R002	5360.23	0.041	0.062	0.088	0.116	0.537	94	1.3	4.68	10.5	15.2	69.2	73	0-5	E	O	E
19	Glen Alpine	A600/04	A6R002	19.95	0.054	0.065	0.086	0.103	0.118	49	1.3	3.39	7.02	8.33	38.2	41	0	E	O	E
20	Grootdraai	C114/02	C1R002	350	0.066	0.101	0.135	0.137	0.702	27	nd						0-5	E	O	O
21	Hartbeespoort*	A210/02	A2R001	186.44	0.306	0.373	0.458	0.6	10.8	182	38.1	79.4	162	195	12200.0	221	0-5	H	H	H
22	Hazelmere	U300/01	U3R001	17.8	0.028	0.045	0.077	0.102	0.157	28	1.3	1.25	1.25	1.25	6.3	28	0-5	M	O	O
24	Henley*	U200/09	U2R005	5.4	0.036	0.045	0.065	0.066	0.117	27	1.3	1.25	4.26	16.3	24.5	32	0-5	E	O	M
23	Inanda	U200/04	U2R004	241.71	0.036	0.057	0.073	0.097	0.189	26	1.3	1.25	5.19	10.3	17.2	27	0-5	E	O	M
25	Jericho	W530/03	W5R001	59.27	0.032	nd	0.166	12	1.3	nd					12.2	11	0	M	O	M
26	Kalkfontein	C510/04	C5R002	258	0.075	0.201	0.314	0.417	0.465	55	8.1	21.4	41	52.6	127.0	57	0	E	E	H
27	Klipfontein	L600/01	W2R001	18.09	0.073	0.136	0.213	0.219	0.333	22	nd						0	E	O	O
28	Klipvoor*	A230/2	A2R012	42.25	0.796	1.09	1.45	2.3	5.08	164	64.5	131	423	604	2590.0	207	0-5	H	H	H
30	Knellpoort	D203/39	D2R006	130.05	0.106	0.152	0.228	0.45	0.47	31	1.3	5.17	8.99	12.4	12.4	11	0	H	O	M
29	Koppies	C700/02	C7R001	42.31	0.096	0.141	0.177	0.214	0.344	85	5.9	14.6	30.3	31.6	82.3	29	0	E	M	H
31	Koster River*	A220/03	A2R011	6.7	0.042	0.051	0.084	0.102	2.76	65	9.6	15.1	20.8	23.4	55.7	72	0-5	E	E	E
32	Krugersdrift	C520/02	C5R004	73.56	0.247	0.326	0.419	0.571	1.43	51	nd	nd	nd	nd	nd	nd	0-5	H	na
33	Laing	R200/02	R2R001	19.83	0.271	0.381	2.94	2.94	2.94	8	7.7	19	68.3	91.4	251.0	23	0	H	M	H
36	Leeukraal	A232/27	A2R016	0.54	1.320	1.5	2.31	2.35	2.75	25	17.6	32	54	57.4	80.8	41	0	H	E	H
34	Loskop*	B320/01	B3R002	361.51	0.040	0.067	0.109	0.123	0.333	90	1.3	1.25	5.94	11.2	38.2	60	0-5	E	O	E
35	Middelburg	B100/13	B1R002	48.06	0.027	0.035	0.051	0.062	0.156	105	1.3	1.25	2.78	4.28	11.2	76	0	M	O	M
37	Middle Letaba	B800/29	B8R007	171.93	0.067	0.076	0.105	0.127	0.432	23	1.3	1.25	5.56	7.39	25.6	24	0-5	E	O	E
38	Midmar*	U200/03	U2R001	235.42	0.022	0.033	0.046	0.048	0.746	27	4.1	6.21	10.1	14.1	21.5	145	0	M	M	M
39	Misverstand*	G100/06	G1R003	6.44	0.089	0.157	0.192	0.242	0.31	55	3.4	6.32	9.99	12.8	17.2	47	0-5	E	M	M
42	Modimola	D411/28	D4R004	20.72	0.173	0.267	0.649	0.795	3.59	210	10.6	38.6	105	174	213.0	65	0	H	E	H
41	Molatedi*	A300/01	A3R004	200.79	0.036	0.051	0.105	0.117	0.232	55	1.3	1.25	4.91	7.15	15.6	35	0	E	O	M
40	Mutshedzi	A802/15	A8R004	2.34	0.023	0.042	0.065	0.145	0.186	37	3.2	6.27	13.3	15.6	18.9	24	0	M	M	M
43	Mzinto*	U803/10	U8R001	0.5	0.046	0.079	0.129	0.15	1.88	31	1.3	2.72	7.96	15.7	69.8	32	0-5	E	O	E
44	Nagle*	U200/10	U2R002	23.24	0.035	0.041	0.095	0.096	0.098	25	1.3	1.25	2.59	5.82	8.0	32	0	M	O	M
45	Ntshingwayo	V300/04	V3R001	271.3	0.064	0.079	0.12	0.137	0.15	27	1.3	1.25	3.36	3.36	3.4	9	0-5	E	O	O
46	Nungwana*	U700/05	U7R002	2.18	0.028	0.037	0.059	0.072	0.187	65	1.3	1.25	1.25	5.83	17.8	27	0	M	O	M
47	Nwanedzi	A804/04	A8R003	5.25	0.024	nd			0.068	19	6.0	nd			16.9	5	0	M	M	M
49	Ohrigstad*	B600/04	B6R001	13.52	0.027	0.036	0.059	0.125	0.42	56	1.3	2.81	5.86	6.49	6.5	19	0-5	M	O	O
48	Rhenosterkop*	B310/05	B3R005	204.58	0.046	0.056	0.079	0.114	0.202	77	1.3	1.25	4.06	8.06	18.4	50	0-5	E	O	M
50	Rietvlei*	A211/58	A2R004	12.75	0.316	0.418	0.548	0.712	2.45	176	35.0	93.8	184	256	1560.0	216	0-5	H	H	H
51	Roodekopjes*	A210/01	A2R015	102.33	0.111	0.162	0.253	1.02	4.24	75	63.6	130	234	260	824.0	78	0-5	H	H	H
52	Roodeplaat*	A230/01	A2R009	42.46	0.194	0.263	0.319	0.418	0.953	181	34.5	70.9	129	179	740.0	210	0-5	H	H	H
55	Roodepoort	C700/03	C7R002	0.87	0.393	nd			1.95	13	17.3	nd			168.0	13	0	H	E	H
53	Rust de Winter*	B310/01	B3R001	29.13	0.041	0.057	0.082	0.116	0.22	64	1.7	6.6	12.9	15.1	87.4	70	0-5	E	O	H
54	Shongweni	U600/03	U6R001	4.5	0.058	0.067	0.091	0.112	0.159	30	1.3	3.71	13.9	14	25.7	29	0-5	E	O	E
57	Spitskop*	C300/01	C3R002	56.64	0.086	0.127	0.147	0.154	0.192	94	26.0	100	300	310	470.0	29	0	E	H	H
58	Sterkfontein	C801/10	C8R003	2616.9	0.016	0.025	0.041	0.054	0.372	230	1.3	1.25	1.25	3.71	3.7	54	0	M	O	O
56	Taung	C301/23	C3R006	61.37	0.042	0.092	0.2	0.292	0.513	212	3.0	8.6	17.7	45.9	28700.0	96	0	E	M	H
59	Theewaterskloof*	H600/02	H6R001	480.19	0.018	0.026	0.063	0.065	0.099	21	1.3	1.41	2.66	2.66	2.7	6	0-5	M	O	O
60	Tonteldoos*	B400/2	B4R001	0.17	0.029	0.043	0.082	0.132	0.4	93	1.0	1.25	1.25	3.29	11.2	64	0-5	M	O	M
61	Umtata*	T201/03	T2R001	248.48	0.072	0.082	0.122	0.137	0.276	46	1.0	1	2.74	2.76	31.9	26	0	E	O	E
64	Vaal*	C120/01	C1R001	2603.45	0.095	0.127	0.151	0.181	0.55	167	4.4	6.82	18.1	25.9	217.0	126	0-5	E	M	H
63	Vaalharts	C900/02	C9R001	48.92	0.073	0.102	0.158	0.224	0.438	163	2.8	8.02	26.8	31.9	147.0	66	0	E	M	H
62	Vaalkop	A220/01	A2R014	53.62	0.061	0.083	0.125	0.206	0.999	81	44.2	60.6	78.1	92.1	116.0	86	0-5	E	H	H
65	Van der Kloof	D310/01	D3R003	3171.3	0.033	0.048	0.076	0.107	0.734	90	1.3	2.37	3.36	6.54	18.1	78	0-5	M	O	M
66	Vlugkraal*	B400/04	B4R002	0.45	0.023	0.031	0.042	0.056	0.213	86	1.0	1.25	1.25	3.78	17.4	54	0-5	M	O	M
67	Voelvlei*	G100/03	G1R001	158.58	0.063	0.075	0.12	0.136	0.41	58	6.6	13.5	46.1	75.2	85.8	39	0-5	E	M	H
68	Vygeboom	X100/02	X1R003	77.84	0.013	0.023	0.044	0.606	0.638	27	1.3	1.25	7.05	7.12	33.0	29	0	M	O	E
69	Welbedacht	D200/01	D2R004	10.93	0.127	nd			0.282	18	1.0				14.1	12	0	H	O	M
70	Witbank*	B100/04	B1R001	104.02	0.063	0.084	0.109	0.113	0.163	40	4.3	16.5	20.8	25.1	33.7	23	0-5	E	M	E

Key: Dams are indicated by name, Dam Register number and DWS Water Management System number. Capacities are in millions of cublic meters (MCM). Sample depths are either sub-surface grab (0 m) or 5m integrated column. Trophic States are shown as H (Hypertrophic), E (Eutrophic), M (Mesotrophic) or O (oligotrophic). nd = no data or insufficient data and na = not assessed.

Table 4. List of maximum chlorophyll-a values in the Department of Water and Sanitation (DWS) National Eutrophication Monitoring Program (NEMP).

	Chla	Sample depth
Sample Date	ug per l	m	Name
31-Jul-06	28700	0	Taung Dam
29-Jul-06	15800	0	Schmidtsdrift on Vaal River
22-Apr-08	14410	0	Roodeplaat Dam
27-Mar-13	12200	0-5	Hartbeespoort Dam
2-May-12	11122	5	Hartbeespoort Dam
2-May-12	8124	1	Hartbeespoort Dam
2-May-12	5805	2	Hartbeespoort Dam
22-Jan-14	4840	0	Hartbeespoort Dam
8-May-12	4358	0	Hartbeespoort Dam
7-May-08	4238	20	Hartbeespoort Dam
27-Mar-13	4123	10	Hartbeespoort Dam
4-Jun-07	4107	0	Roodeplaat Dam
28-Mar-07	3919	0	Hartbeespoort Dam
27-Mar-13	3783	5	Hartbeespoort Dam
2-May-12	3398	10	Hartbeespoort Dam
8-May-13	3288	0	Hartbeespoort Dam
2-May-12	2837	15	Hartbeespoort Dam
25-Apr-07	2612	0-5	Hartbeespoort Dam
14-May-13	2586	0-5	Klipvoor Dam
26-Nov-08	2529	0-5	Klipvoor Dam
14-Feb-07	2438	0	Hartbeespoort Dam
18-Apr-12	2427	0	Hartbeespoort Dam
19-Nov-07	2344	0-5	Roodeplaat Dam
4-Jun-07	2315	0-5	Roodeplaat Dam
16-May-12	2216	0	Hartbeespoort Dam
3-Dec-08	2165	0	Hartbeespoort Dam
5-May-05	1981	0	Hartbeespoort Dam
12-Feb-07	1981	0	CR Swart Dam
12-Feb-07	1967	0	CR Swart Dam
16-Jul-08	1839	0	Hartbeespoort Dam
10-May-06	1825	0	Roodeplaat Dam
13-Aug-07	1818	0	Roodeplaat Dam
4-May-10	1808	0	Bospoort Dam
27-Mar-08	1787	0	Hartbeespoort Dam
18-Feb-08	1787	0	Bon Accord Dam
15-Nov-06	1764	0	Bon Accord Dam
23-Apr-07	1654	0	Roodeplaat Dam
5-Nov-07	1645	0-5	Roodeplaat Dam
27-Mar-13	1601	20	Hartbeespoort Dam
20-Aug-13	1599	0-5	CR Swart Dam
12-Feb-07	1586	0	CR Swart Dam

TABLE 5. Chlorophyll-a and total phosphorus (TP) trophic states of the impoundments (from Matthews, 2014).

		Capacity	Chlorophyll-a		Chla Trophy per OECD		TP Trophy per OECD
#	Name	MCM	This paper	Matthews	This paper	Matthews	This paper
1	Albert Falls	289.12	1.3	8.4	O	E	M
2	Allemanskraal	179.3	5.2	248	M	H	H
3	Bloemhof	1240	9.6	142.8	E	H	E
4	Brandvlei	284.29	na	8.4	na	E	na
5	Bronkhorstspruit	59.73	42.4	105.9	M	H	H
6	Darlington	183.89	na	120.5	na	H	na
7	Erfenis	207.72	na	351.4	na	H	na
8	Flag Boshielo	185	9	42.6	E	H	E
9	Gariep	5360.23	1.3	137.2	O	H	E
10	Goedertrou	301.26	na	20.1	na	E	na
11	Grassridge	46.19	na	176.7	na	H	na
12	Grootdraai	350	nd	163.4	O	H	E
13	Hartbeespoort	186.44	38.1	92.6	H	H	H
14	Heyshope	449.8	na	23.7	na	E	na
15	Inanda	241.71	1.3	27.3	O	H	E
16	Jericho	59.5	na	18.7	na	E	na
17	Kalkfontein	258	8.1	117.3	E	H	E
18	Klipvoor	42.25	64.5	145.7	H	H	H
19	Koppies	42.31	5.9	133	M	H	E
20	Krugersdrift	73.56	nd	317.9	na	H	H
21	Loskop	361.51	1.3	58.1	O	H	E
22	Lubisi	158	na	82.8	na	H	na
23	Midmar	175.06	na	65.6	na	H	na
24	Mokolo	145.37	na	31.4	na	H	na
25	Ncora	150.05	na	380.5	na	H	na
26	Ntshingwayo	271.3	1.3	314.2	O	H	E
27	Pongolapoort	2276	na	3.8	na	M	na
28	Roodekopjes	102.33	63.6	147	H	H	H
29	Rustfontein	72.07	na	115.6	na	H	na
30	Spioenkop	271.3	na	67.5	na	H	na
31	Spitskop	56.64	26	163.4	H	H	E
32	Sterkfontein	2616.9	1.3	3.3	O	M	M
33	Theewaterskloof	480.19	1.3	43.1	O	H	M
34	Tzaneen	156.53	na	39.9	na	H	na
35	Umtata	248.48	1	478.3	O	H	E
36	Vaal	2603.45	4.4	99.6	M	H	E
37	Vaalkop	53.62	44.2	108.5	H	H	E
38	Van der Kloof	3171.3	1.3	55.3	O	H	M
39	Voelvlei	158.58	6.6	114.7	M	H	E
40	Witbank	104.02	4.3	117.5	M	H	E
41	Woodstock	373.25	na	58.1	na	H	na
42	Xonxa	125.9	na	67.5	na	H	na
43	Zaaihoek	184.7	na	14.3	na	E	na

Key: Capacities in millions of cubic meters (MCM), Chlorophyll-a values in microgrammes per liter. Trophic States are shown as H (Hypertrophic), E (Eutrophic), M (Mesotrophic) or O (oligotrophic). nd = no data or insufficient data and na = not assessed.