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85 Table J25: Number of stations with various lengths (years) of streamflow data for catchments of given size in South Africa, 1980. Province Area length of record (years) (km 2 1 >75 50 -74 25 - 49
86 have streamflow gauges situated within 20 km of the coast, resulting in difficulties in evaluating river flow into estuaries. Furthermore, 59 of the 73 rivers draining into estuaries have no streamflow gauges at all. The Division of Earth, Marine and Atmospheric Science and Technology, CSIR, PO Box 320, Stellenbosch, 7599, accordingly provided simulated monthly virgin runoff data (at the mouth) for 69 rivers in NatallKwaZulu draining into estuaries. The data-span covered the years 1921 - 1975. The runoff data were derived from reports produced by the then Hydrological Research Unit, University of the Witwatersrand*. For further details see Perry (1986)**. 10.14 International rivers of Natal and environs*** Recommendations drawn up by the International Law Association in Helsinki in 1966 (known as the Helsinki Rules), concern the joint use of water common to two or more states****. The Helsinki Rules define an international drainage basin (also termed an international watercourse system) as a geographical area extending over two or more states; and which is determined by the watershed limits of the system of waters including surface and groundwaters - flowing into a common terminus. A basin state (also known as a system state), is defined as a state whose territory includes a portion of an international drainage basin. Each basin state is entitled (within its territory), to a reasonable and equitable share of the water of an international drainage basin which can be beneficially used. The principle of equitable sharing implies that the maximum benefit with the minimum disadvantage should accrue to each basin state, following from the use of the common water. This does not mean that every state must necessarily receive an * ** *** **** See Middleton, B.J., lorentz, S.A., Pitman, W.V. and Midgley, D.C., 1981. Surface water resources of South Africa, VOl V: drainage regions MNPORST. The eastem Cape Part 1 (Text), various pages, and Part 2 (Appendices), various pages, HRU Report No. 12/81, Hydrological Research Unit, University of the Witwatersrand, Johannesburg, as well as Pitman, W.V., Middleton, B.J. and Midgley, D.C., 1981. Surface water resources of South Africa, VOl VI: drainage regions UVWX. The eastem escarpment Part 1 (Text), various pages, and Part 2 (Appendices), various pages, HRU Report No. 9/81, Hydrological Research Unit, University of the Witwatersrand, Johannesburg. See Perry, J.E., 1986. Basic physical geographyihydro data for Natal "estuaries", NRIO Data Report No. 0 8607, Sediment Dynamics Division, Coastal Engineering and Hydraulics, National Research Institute for Oceanology, CSIR, Stellenbosch, 6 p. + app. Discussion based on Anonymous, 1986. Management of the Water Resources of the Republic of South Africa, Department of Water Affairs, Pretoria, various pages. An interesting sub-discipline is that of "hydropolitics" namely, the study of political interactions between countries, especially in water-scarce regions. There are those who believe that future warsin certain parts of the world - will be fought over water.
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A WATER RESOURCES AND SANITATION SY
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Contents 1 11111111111:1&11 CHAPTER
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lillllllllllll.'. Tables (continued
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11111111];11,,11. 10.1 Introduction
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Table J2: Water budgets for Natal/K
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Table J4: Overall gradient distribu
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13 111.IJJ1111111 (when runoff: rai
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Table J7: 15 Hi) A small part of Kw
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17 1\11••111;[11. Table J7: App
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19 TableJ8: Hydrological Research U
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21 11111••111111111 TableJ9: Cr
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23 Table J10: Areas. mean annual pr
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25 1111III1I11,rllll Table J10: Are
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Page 38 and 39: 35 Table J10: Areas. mean annual pr
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Page 43 and 44: IlfllllllllllJJilll 40 Table J12: K
Page 45 and 46: 10.6 Runoff models 42 Models are no
Page 47: 111I111'llll1JII 10.9 The variabili
Page 52 and 53: 49 lil11l1tllll;lllll Table J20: Es
Page 54 and 55: 51 Table J20: Estimated annual wate
Page 56 and 57: 53 Table J22: Estimated annual wate
Page 58 and 59: 55 Ijlllltl1llflll (ii) Considerabl
Page 60 and 61: 57 large catchments data. The Centr
Page 62 and 63: 59 1111111111111' KwaDlangezwa, 283
Page 64 and 65: Other reports 61 Research Unit, Dep
Page 66 and 67: 63 1IIIIIE1111Elfl Id} The rest of
Page 68 and 69: 65 Table J24: Department of Water A
Page 82 and 83: 79 Table J24: Depanment of Water Af
Page 84 and 85: 81 Station closed Station closed U2
Page 86 and 87: 83 Station Drainage region Station
Page 90 and 91: 87 iI11J111!!ltllllil equal share i
Page 92: 89 Source: liI After Anonymous, 198
Page 95: 111111111111111 92 boards (discusse
Page 98 and 99: Table J28: Some relevant data on se
Page 101 and 102: IDIIIIIDII':1111 98 (ii) The co-ord
Page 103 and 104: 100 the respective departments at P
Page 105 and 106: 1IIIIIIJIII.i1 102 Table J31: Categ
Page 107 and 108: 104 10.16.2 Environmental impacts o
Page 109 and 110: Table J32: 106 A simplified form of
Page 111 and 112: 1111111111111 108 Table J33: Action
Page 113 and 114: 110 There is a growing South Africa
Page 115 and 116: 112 Attention has also been focused
Page 117 and 118: 114 10.17 Some legal aspects of wat
Page 119 and 120: 116 time (mean exceedance flow), du
Page 121 and 122: IIII.IIWIIIII 118 10.17.4 Use of wa
Page 123 and 124: 1[lIlIIIIIIJ. 120 Government dams,
Page 125 and 126: 10.18.4 River diversions 122 Depart
Page 127 and 128: 124 10.18.6 Irrigation districts an
Page 129 and 130: 111(11111:41m'l 126 Table J36: Irri
Page 131 and 132: Table J37: Irrigation boards in Nat
Page 133: Tabla J37: Irrigation boards In Nat
Page 136 and 137: 133 Table J38: Some urban areas in
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135 Table J38: Some urban areas in
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Table J38: 137 Some urban areas in
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139 Source: (i) After Ardington, E.
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141 i111_1illll1l noted above!. are
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143 (ii) The Directorate of Land an
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145 1111111111111 the Board will as
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147 Table J40: Administrative regio
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149 111II1.llllIf:J Government Noti
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151 111I.lIllllil1 Government agenc
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153 Table J43: Joint Services Board
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156 Source: (i) After Jenkin, F. (e
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158 Chief Directorate: Administrati
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Source: See also: Note: 160 Afterth
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162 off low - responsible inter ali
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11111.'.111:11111 164 If it became
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tlll••••I:IB11 NOTES: 166
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Contents 167 CHAPTER 11: GROUNDWATE
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Tables 169 Table K1: Some geologica
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174 Bate, 1992}*. The use of water
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176 X313, Pretoria, 0001; as well a
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179 a particular site, then a stati
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181 111...1[111 of streams and rive
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183 good. with a total dissolved so
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(iii) Holocene sands lQuaternary) 1
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187 Table K1: Some geological forma
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189 fault-bounded blocks, although
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191 11.6.4 Aquifer characteristics
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193 coarse and the latter, fine and
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195 111.BIII!I!111 The yields of bo
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11...,].11 198 11.7 Methods of grou
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201 11...11111 Table K3: Methods of
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203 boreholes are drilled for both
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205 1111111111'.1 3838. The borehol
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207 11.11 Standards applicable to t
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(a) Gravity springs 209 Gravity spr
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Table K4: Spring discharge in the V
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214 Table K5: The number of ephemer
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JJI...lllJll 218 (h) Some of the wa
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i'•••liDl Group E: Pure water
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222 Bond, Van Wyk proposed the foll
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1[11....11.,1 224 (b) Chlorides are
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226 Source: Edwards, T.J., 1989. Pe
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228 also obtainable from the Ground
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Ill1••lll1l 230 • Hofkes, EH.
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232 • Vegter, J.R., 1995. Groundw
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234 • Meyer, R. and Godfrey, l.,
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Springs 236 • Africa Co-operative
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NOTES: 238
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239 CHAPTER 12: WATER SUPPLY PLANNI
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12.1 Introduction 241 111'1&111111
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243 rilliltl.'ll water consumption
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Table L2: Cattle 245 study of reduc
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Note: (j) (ii) (iii) 247 Animal wat
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249 111111:llllltJI Source: After A
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1111111118.1 252 Table L4: Some per
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lillll.'.II' 254 high income. Iow d
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* 256 to obtain. Difficulties inclu
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1111...11 (iii) 258 Home Glasson Pa
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260 Table L6: Some typical domestic
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* ** 262 are in agreement with cons
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Table L7: Some South African indust
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Table L7: 267 Some South African In
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Table L7: 269 Some South African in
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Table L7: 271 Some South African In
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Note: (i) (ii) (iii) (iv) (v) (vi)
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276 concentrate on the provision of
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278 Table L8: RSA-KwaZulu Developme
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Table L9: 281 RSA-KwaZulu Developme
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Table L9: 283 RSA-KwaZulu Developme
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286 the Green book, namely, Anonymo
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IIIRlmlllillS 12.4.2 Durban Metro W
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291 design phase of projects. Any a
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294 Table L12: Some extant water wh
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11111111111911 296 • Energy Resea
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299 11111111111111 Table l13: Speci
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301 Table L13: Specific training ag
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304 Road and Umlazi (Durban); Pinet
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307 Table L14: A spatial typology o
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310 Table L15: A typology of social
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1111111..11 312 Table L15: A typolo
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315 114,[llll1\'1 Table L16: Some s
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317 Table L18: Mean household size
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319 Illil;JJtllllll Table L19: Exis
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321 Table L19: Existing housing del
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323 1IIIi!:lil.'11 a month, and a s
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NOTES: 325
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