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• Thomas, W.M., 1951. Part 2. Chapter 4. Some aspects of water resources in
Natal, In: Burrows, H.R. (ed), Natal Regional Survey, VOl 1: Archaeology and
Natural Resources of Natal, Oxford University Press, Cape Town, p. 112 - 135.
(The chapter provides brief, historical data on gauging stations including runoff,
catchment area and geology).
• Thorrington-Smith, E., 1953. Tugela Basin: a regional survey ofthe catchment area
of the Tugela River and its tributaries, Natal Town and Regional Planning
Commission Interim Report, Pietermaritzburg, 143 p. and maps.
• Thorrington-Smith, E., 1960. Towards a plan for the Tugela Basin: second interim
report of the regional survey of the Tugela Basin, prepared in the Office of the
Town and Regional Planning Commission, Natal, Natal Town and Regional Planning
Commission Report, VOl 5, Pietermaritzburg, 266 p. and maps.
• 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.
10.12 Department of Water Affairs and Forestry hydrological gauging station reference
system and network
The reference numbers of hydrological gauging stations consist of alpha-numerical
characters. A typical reference number, for example, U2H011 is indicative of several
parameters:
(a) The first alphabetical character identifies the main (primary) drainage region, for
example, where U indicates the Mkomaas/Mgeni River drainage region.
(b) The second character is the second last digit of the secondary drainage region,
namely, the 2 from 19Z0, the Mgeni River catchment area.
(c) The third character is an alphabetical character which indicates the type of gauging
station as shown in Table J23.