Water Management Area		Natural resource		Usable return flow			Total local yield
		Surface water	Ground-water	Irrigation	Urban	Mining and bulk industry	Total local yield
		(Mm³/a)
1	Limpopo	160	98	8	15	0	281
2	Luvuvhu/Letaba	244	43	19	4	0	310
3	Crocodile West and Marico	203	146	44	282	41	716
4	Olifants	410	99	44	42	14	609
5	Inkomati	816	9	53	8	11	897
6	Usutu to Mhlathuze	1019	39	42	9	1	1110
7	Thukela	666	15	23	24	9	737
8	Upper Vaal	598	32	11	343	146	1130
9	Middle Vaal	−67	54	16	29	18	50
10	Lower Vaal	−54	126	52	0	2	126
11	Mvoti to Umzimkulu	433	6	21	57	6	523
12	Mzimvubu to Keiskamma	777	21	17	39	0	854
13	Upper Orange	4311	65	34	37	0	4447
14	Lower Orange	−1083	24	96	1	0	−962
15	Fish to Tsitsikamma	260	36	103	19	0	418
16	Gouritz	191	64	8	6	6	275
17	Olifants/Doring	266	45	22	2	0	335
18	Breede	687	109	54	16	0	866
19	Berg	403	57	11	37	0	505
Total South Africa		10,240	1088	675	970	254	13,227
Total South Africa		77.4%	8.2%	5.1%	7.3%	2.0%	100%