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(1981); and Pitman, Middleton and Midgley (1981)* which - besides maps - contain
summaries of monthly totals of observed streamflow for specific catchments, as well as
simulated streamflow for quaternary sub-catchments, mainly for a 55 year period up to
1975 (based on the Pitman Model). A further important reference is: Anonymous, 1986.
Management ofthe Water Resources of the Republic of South Africa, Department ofWater
Affairs, Pretoria, various pages. (The book contains a wealth of material on water in South
Africa and is a comprehensive reference work). Another useful reference is: Schulze, R.E.,
1984. An assessment of the surface water resources of Natal, Natal Town and Regional
Planning Commission Report, VOl 63, Pietermaritzburg, 44 p. and map. The publication
contains several maps and diagrams, namely: hydrological response zones in Natal; mean
annual runoff; areas with significant outliers of monthly runoff; median monthly flow for
the hydrological year October - September; a monthly runoff variability index for the
months October - September, and a map showing areas of low mean annual runoff.
The Computing Centre for Water Research, University of Natal, Pietermaritzburg, can
supply (autographic gauge) runoff data for certain small research catchments, autographic
data for selected storm events (runoff/rainfall), and mean annual series of flood peaks in
*
See Middleton, B.J., lorentz, SA.. Pitman, W.V. and Midgley, D.C., 1981. Surface water resources
of South Africa, VOl V: drainage regions MNPQRST. The eastern 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 eastern escarpment Part 1 (Textl, various pages, and Part 2 (Appendicesl, various pages, HRU
Report No. 9/81, Hydrological Research Unit, University of the Witwatersrand, Johannesburg. The
two reports are part of a six volume series. The entire set of six volumes (for the whole country) was
reprinted in 1986 with several amendments. The series has been updated, and currently consists of
six volumes - each comprising a set of appendices and a book of maps - with an overall user's
manual. Data contained in the hard copy volumes are also available on CD-ROM. See: Midgley, D.C.,
Pitman, W.V. and Middleton, B.J., 1994. Surface water resources of South Africa, 1990, VOl V:
drainage regions M, N, P, Q, R, S, T. Eastem Cape - appendices, WRC Report No. 298/5.1/94, Water
Research Commission, Pretoria, various pages. as well as Midgley. D.e., Pibnan. W.V. and Middleton,
B.J.. 1994. Surface water resources of South Africa, 1990, VOl V: drainage regions M, N, P, Q, R,
S, T. Eastem Cape - book of maps, WRC Report No. 298/5.2/94, Water Research Commission,
Pretoria, 30 p. and maps. See also Midgtev, D.C.. Pitman, W.V. and Middteton, B.J., 1994. Surface
water resources of South Africa, 1990, VOl VI: drainage regions U, V, W, X. Eastem escarpmentappendices,
WRC Report No. 298/6.1194, Water Research Commission, Pretoria, various pages, as
well as Midglev, D.C., Pitman, W.V. and Middleton, B.J., 1994. Surface water resources of South
Africa, 1990, VOlVI: drainage regions U,V, W, X. Eastern escarpment - book of maps, WRC Report
No. 298/6.2/94, Water Research Commission, Pretoria, 30 p. and maps. Refer in addition to Midglev,
D.C., Pitman, W.V. and Middleton, B.J., 1994. Surface water resources of South Africa, 1990:
user's manual, WRC Report No. 298/1194, Water Research Commission, Pretoria, various pages.
(Note that a complete listing of all the reports can be found on the inside front cover of any given
report. Nearly all maps in the books of maps are at a scale of 1 : 1 000 000. Each book of maps
contains a base map indicating catchment boWldaries, rivers, major dams and towns: as well as
information onrainfall (stations, zones and isohyetsl: evaporation (stations. zones and isolinesl: runoff
(stations, zones, isolines and endoreic areas): land cover (minor dams and afforestedlirrigation areas);
streamffow modelling (model parameters); geology; soils; sediment yield and vegetation).