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Forty-one river profiles including surface geology, gradient, height above sea level and
distance from source, plus existing and possible dam sites as well as sections of rivers
flowing through KwaZulu territory, or rivers forming the boundary with KwaZulu, are
presented in Thorrington-Smith, Rosenberg and McCrystal, 1978. Towards a plan for
KwaZulu: a preliminary development plan, VOl 1, The written report, 341 p., and VOl 2,
Atlas of maps and illustrations, various pages, KwaZulu Government, Ulundi. Similar data
(including catchment area maps) can be found in Ninham Shand and Partners, 1971.
Water resources of the Natal South Coast, Natal Town and Regional Planning Commission
Report, VOl 18A, 31 p. + app., and VOl 18B, Appendices, various pages,
Pietermaritzburg; as well as in Chew, J.A. and Bowen, 1971. The water resources of the
coastal areas of northern Natal and Zululand, Natal Town and Regional Planning
Commission Report, VOl 17, Pietermaritzburg, 18 p. + app.
10.4 Drainage catchments and related data in NatallKwaZulu
South Africa is divided into a number of primary, secondary, tertiary and quaternary
catchments. The four main (primary) drainage regions in Natal/KwaZulu as determined by
the Department of Water Affairs and Forestry, are from north to south - the W, V, U and
T regions. Parts of the W drainage region are outside Natal/KwaZulu, While most of the
T drainage region is in the Transkei. The secondary drainage regions, also as defined by
the Department of Water Affairs and Forestry for Natal/KwaZulu are: W10, W20, W30,
W40 and W70 (W primary drainage region - the Mhlatuze, Mfolozi, Mkuze and Pongola­
Usuthu catchments)·; secondary drainage regions V10, V20, V30, V40, V50, V60 and
V70 (V primary drainage region which is wholly situated within Natal/KwaZulu - the Tugela
catchment); secondary drainage regions U10, U20, U30, U40, U50, U60, U70 and U80
(U primary drainage region which is likewise wholly situated in Natal/KwaZulu - the
Mkomaas and Mgeni catchments), and secondary drainage regions T30, T40 and T50 (T
primary drainage region -the Mzimkulu, Mtamvuna and Mzimvubu catchments). Area and
runoff data for the secondary drainage regions are presented in Table J6. Readers should
bear in mind that the Department of Water Affairs and Forestry applies a further coding
• Note that W50(O) and W60(O) are not in NatallKwazulu. Secondary catchments are most often
referred to without the third digit, for example, W60 is the same catchment as W600. The far
northern ZuJuland coastal plain is in secondary catchment W70. which is an area with an enclosed
drainage pattern. localized runoff only is found in conjunction with wetlands (pans).