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Contents
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CHAPTER 10: A BRIEF INVENTORY OF THE SURFACE WATER
RESOURCES OF NATAUKWAZULU
10.1 Introduction............................................. 6
10.2 Precipitation and runoff in Natal/KwaZulu ...••••....••....•...... 6
10.3 Rivers of NatallKwaZulu .•.•.........•........••...••.•....• 8
10.4 Drainage catchments and related data in Natal/KwaZulu . . . • . . . • . . • • •• 11
10.4.1 KwaZulu catchments. . • • . • • • • • • • . . • • • • • • • • • • • • . • • • •• 39
10.5 Homogeneous climate zones in Natal/KwaZulu ••••••••.....•••..•. 40
10.6 Runoff models . • . . . . . • . . • . . . . . . . . • • . • . . . • • • . • . . . . . . . . . . •• 42
10.7 Mean annual runoff in Natal/KwaZulu . . • • • . • • • • . • • • . . . . • .• . . . • •• 43
10.8 Median monthly runoff in Natal/KwaZulu ••.••....•••.....•...••• 43
10.9 The variability of monthly runoff in NatallKwaZulu . . . . • . . . . . . • . . • • .• 44
10.10 Water demand in NatallKwaZulu •...••...••..........••••.•••. 44
10.11 Sources of hydrological data ••••••.•.••.•••••••.....•.•....•• 55
10.12 Department of Water Affairs and Forestry hydrological gauging station
reference system and network • . . • . . . . • • • • • . . . . . . . • . • • • • • • • • .• 62
10.13 Aspects of runoff data for Natal/KwaZulu
10.14 Intemational rivers of Natal and environs
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10.15 Some voluntary river catchment and similar organizations in Natal/KwaZulu 89
10.16 Dams in NatallKwaZulu . . • . • . . . • . • • • • . . . . . . . • . • • . • . . . . . • . • •• 92
10.16.1 Classification of dams for safety purposes . . . . • . • • . • . • • • • •• 92
10.16.2 Environmental impacts of dams and other works •••••••••••. 104
10.17 Some legal aspects of water in South Africa .•••••••••••••••••.•.. 114
10.17.1 Public and private water •••.•....••..•....•••.••••... 114
10.17•2 Riparian rights ..•••••••.••••••••..•....•••••••••.• 115
10.17.3 Use of water by local authorities. . . . • • . . • • • • . . . . . • • • • • .• 117
10.17.4 Use of water by industrial undertakings ••••.......•••••••• 118
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